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I'd say too much white space on the first two.  The third and fourth look like zoo snapshots.  The monkey gets lost among the rocks.  Can't tell what the fifth is, and the white balance looks off in the sixth.  Too much blue in the grass.

Istock loves bluegrass

These guys want to discourage you. My advice is:
Don't pay too much attention at FT rejections. If FT doesn't want to sell your photos, other agencies WILL sell them. Fotolia rejects most of my images lately because my photos didn't reach aesthetic quality. I guess they can't find real technical reason for rejection, so they have to putt something as reason for rejection.
Work on your technique, improve your skills. Find articles on internet about composition and white ballance, and upload to FT everything you make. If they reject 80% of your images, don't worry, just focus on other agencies.

1 & 2 boot design copyright / trademark
3 shadows, bird butt, not interesting? Too many like this?
4 monkey is brown on brown, Copyright Zoo photo?
5 can't tell, looks soft. (might be wrong) how many paint sprayers isolated on white, do they have? 
6 Got me? Aside from what others said about possible color balance, looks passable.

Didn't they give you reasons?

It's hard to tell from small shots if there's a focus issue or something else that I can't see.

@Magnum and Fotographer,
This guy need really constructive critique, not just "your photos suck". Constructive critique is when someone tells you what's wrong, and then tries to help you solve it. Give him some good advice, and encourage him to continue. He is obviously already frustrated because his photos were rejected. All he wants is to get his photos accepted at Fotolia, but he doesn't understand what's wrong with his photos. So, critique like "Your photos look like snapshots" sounds bit humiliating. If I was in his place, I would already think I have to sell my camera because everyone laughs at my photos.
Remember when you started submitting your work? ...I remember when I started...
So, donding, find articles about composition. Reading them should give you some knowledge about where you should put objects when you make pictures. Fnd find articles about white balance. I see that almost all your images (except monkey and a bird) look blueish. Look at the grass at the image with a bird, and look at the grass on the image with a bull. See how blue is grass in the last image?
And again, don't worry about Fotolia's rejections. Do you see how many threads on different forums talk about this?

Also the question asked was 'Tell me your honest opinion on these photos..' not help me take better photos.

Ok, you won...
But my opinion is still that Fotolia's rejections can't be taken seriously. I don't trust in their consistency as I trust in IS consistency of rejections. If I'm not right, there wouldn't be so many threads about silly rejections of Fotolia.
So, I would never take FT rejections seriously and I would never count it as relevant site to help me understand what's wrong with my photos.

 

I think your last 2 shots are definately your best ones. I agree with whitechild and the others at the same time. I think FT are pathetic in there reasons for rejection and all the threads by so many people on here show that. Looking at the images though I do agree the first 2 isolations needed to be a bit closer and the pink boots look a bit dirty. The first animal shot you could just tell FT would reject as they reject much better shots than that one.

Dont be discouraged if they have been accepted elsewhere then be happy that they are up for sale somewhere and havnt just been rejected by all agencies. I think we all get puzzled at some point when FT reject certain images. They are not bad images at all just obviously not what FT want so move on and keep shooting

Whitechild, cudos to you. Admitting wrong is a great characteristic trait.
You are right we have to tell people in a kind way what they can do different. While I am sure he has some good ability to shoot images, and these images are not bad at all, they are not the kind of images which earn you back what you invested in time and effort to shoot, keyword, submit and categorize them no matter how you crop them. I myself fell victim to shoot whatever you find and try to sell it as stock. It simply is not worth your time and effort, the time of the reviewer and the time of the buyer to search trough all that stuff. I am gradually starting deleting this kind of images. (Admitted many are much worse then the once in this thread).
So I do agree with the others. Don't take it personally, but accept it as a challenge donding.

Do I look like I'm laughing?



. Seriously, I'm not grumpy, I just cut to the chase.  Too much other stuff to do to be all flowery.

And yes, it's easy to be misjudged in the forum....but not if you chose your words. You can always express your positivity, if there is one inside you. You will agree I'm right

Thank you for the compliment. I know you are a nice person too. Otherwise you would never write what you just wrote. I didn't say I never do the same thing. We are all human. Internet is a place where people don't think much about other people feelings. In real life, things are different...
Hey! We are discussing here about donding images, and he didn't say a single word!  He just posted images and disappeared