I'm too new to compete with you folks in sales.  A funny thing though.  'bout two weeks ago I posted to Shutterstock a series of 3 xrays of my knee.  Guess I have sexy bones. They've sold 20 times already!! Forget about the landscape, the office meeting or the sliced vegetable shots.... dig out your old xrays, take a pic of them and get'em posted.   Ha ha ha ha ha ha...

It's tuff finding your way into the application area... Hope this works for you.
Go to  gettyimages.com
.. at the bottom of that screen click on   'about us'
.. at the bottom of that screen click on   ' media'
.. at the bottom of that screen click on  'contributors'

that will lead you to the 'get started'  area. 
There are a series of information packs to read. Once read, you would email them at the submission guidelines area requesting the specifics required.

they will mail you back the guidelines... there are a few questions to consider...  are you familiar with the workings of ad agencies and  working with models..    are you familiar with the model release legalities... are you able to work with art directors or follow their creative briefs...  are you able to finance your own shoots up front...are you confident in your own creative ability to produce highly saleable content....     do you have the willingness to go on assignment...  etc.

My impression is that they weren't especially interested in using all your current photo's  { although I also felt that they would take them } but rather, they are more interested with what you can now produce for them. Obviously, all of those photos in their inventory can't be,  'currently produced',  they must be from the photographer's past inventory. Some of the material you will read can be kind of vague.   
   They will ask for 15  low rez (72 dpi) examples of your best work. That can be submitted via email.

What I didn't notice anywhere was a minimum size requirement of the files. For example,  when I applied to Jupiter, they say right up front that you must be shooting with a camera producing a minimum 12 megapixels. I'm not at this time.  As for uprezing... I have no clue.  Getty said nothing of uprezed either. Yet Alamy requires you to uprez to 42 meg....  if  I'm understanding the Alamy requirement incorrectly, someone PLEASE, straigthen me out.

I answered the questions and sent in my 15 low rez and they acknowledged it all saying thanks,  and don't expect an answer for at least a month.

I hope that's of value to you, Bateleur.

I applied to Getty a few weeks ago and my work is currently under review. I'm told by them that they will notify me one way or another. I am keeping my hopes humble.

.
       
tom

41% of my last batch to DT rejected for the same reason as well.   "This is a well-covered subject... blah blah blah... "   That's a change from my usual rejection, "too many on site now..."   Oh well, it's their site.  The other guys didn't feel that way, and some of those rejected sell there no problem.  If i can't sell it on DT, I'll sell it with the competition. No problemo.
         At least they are equal opportunity rejectors. Seems quite a few are getting the 'pink slip'.

I'm still hanging,  this week I hit a month with stuff waiting for review. I only have 74 in the box, not like it's a few hundred...wish they'd get going, pull 'em out and look at 'em.    I'd like to put up more, but...  I'm getting tired of looking at the piggy bank with the number 1  in it.  And I know that's not because I'm "Number 1"  with the pig.  lol   Can't sell 'em if the people can't see 'em!

I'm getting the impression from you folks that the only way you knew what was accepted was to go in and look?

Professor...  just jumping in now...  as to your view question.  I'm relatively new to FT, 1st upload in late August.  This is my highest rejection site, higher than SS. Pix that sell well for me on DT, BS & even SS, they reject for mainly one reason,  "Aesthetic quality" which I still have no clue what that is. As for hits, low, really low. I've gone on as a customer and did searches for my pix, detail key word requests and utilizing 'newest' search...   and,  cannot find my pictures.  ?  I've gone thru entire multiple dozens of pages looking for specific shots, and never found them.
Who knows.............. ........the hits remain low even to the point of one or zero after of a couple weeks. Yet the same pic elsewhere, high views and modest sales.  tgt

Whatever happened behind that whole USphotostock fiasco?  I know they're back up and running but....    Since the crash,  I've shy'd away from them, however I still have a little over a hundred pix on board. Got a gazillion hits, but the only sale was one that a friend made just so I could see if credit came my way.  It did. Sold zero else since. And these are pix that sell well on DT, BS, SS, Fotolia & Lucky,  however, zip on USPS. 
dbvirago,  I recall reading on another site some time ago that you might look into the matter with the (was it Utah?) Attrny Gen???  Or am I wrong?  Did I also see you pulled out of USPS, correct??? Didn't notice your name in the photog list?
Any idea  ( from anyone) what happened,  and are any of you still loading there? Or have any of you  pulled out?  Thanks in advance for any data.   tgt

Sorry CJ,  I can see my comment didn't answer the question....  they were just sliced and diced, I didn't   de-rez  anything.  Just trimming up to put the subject in better position.

Nothing up as of today.  All my stuff is still in the box. They must have a heck of a backlog...   or,  my pix really suck and I've been pushed to the side..   LOL

... all night last night, what a grand waste of my time.  I tried loading a large batch several times up until midnight EST.  I'd get about 2 minutes into the load and that "Proxy" error popped and crashed the site.  I too thought it might be me, tried dumping the cache, reboot and all.  Didn't matter, crashed 2x more.

yeah...  you can still access your USPS personal data and gallery... and i've noticed that my views continue to increase... but.. no downloads..
    interestingly, you can also buy credits.  Funny how that part of the site still works just fine....  3-5 days, hunh?    I would think that if there were a legit problem, they'd have mailed all the photogs with some explanation or update...  as it is.............   ?

Back to add on:   I just googled  USPhotoStock under images. About 2 dozen pages came up with pix from the site. Clicking on any takes you right into the site.  I tried to buy one right up to the final click to complete the transaction. Seems you can readily buy from USPS. Has anyone tired to actually buy one of their photos?