MicrostockGroup

Would just like to pass this tip on...Downsizing your image before uploading for inspection will guarantee the overall quality of that image improves.It's also very easy to do in adobe and 2800 x 1860 will still give you a LARGE  file for the buyers.

Do you are shank ali from the Istock forum?

We are all reviewers to a certain extent.If you dont view your files at 100% you wont see what a reviwer/inspector will.Compressing the pixels in your final image makes those imperfections less and its more likely to get accepted into your respective portfolio.Maurice Vanderwald gave me this wonderful advice last year and it WORKS.

The canon 450D will give you a file 4272 x2848 which if not cropped,and really it should not be if your careful with your overall composition,will provide an XL IMAGE.
I mention this as a recent best match on istockphoto did indeed favour XL images.

i agree with fred.
it's better to shoot properly with a 4MP camera with no downsizing, then shoot 14MP and downsize to 4MP. 
 downsizing may solve improper lighting and exposure, but that is only hiding the obvious problem, ie. wrong exposure and shooting technique.
also, downsizing means selling your images as L, M, or S, or even XS, if you have to downsize.
you earn less money.
that's my opinion, though! 
 

If you downsize to the minimum size that doesn't mean your image drops out of a size bracket (i.e. go to the min L size if you're starting with an image in between L and XL) it can be the difference between acceptance and rejection on some occasions for focussing or artificating issues.

Better to do that, or even download to the absolute minimum than to not upload at all! No-one gets it right 100% of the time and it is a numbers game at the end of the day,