1 - Nice realistic image, but the brightness of it lets it down.
2 - Pretty good, I like the colour scheme, but the yellow light patches ruin the subject's full depiction.
3 - I do quite like it (MLP :3), but the random images and brightness on the right slightly ruin it for me.
4 - Quite bland, IMO. The detail on the tiger's face is quite well done, but it lacks colour and depth.
5 - My favourite, due to the dark humour and plasticine beaver. If it needed to be improved, the background could've been worked on a little more, possibly.
6 - Weird, and a bit too flashy for my liking. I can appreciate that a lot of effort went into it though.
7 - My 3rd favourite, due to the subject is quite inventive and is well done, but it loses out a little due to rigidness of the shark and the lack of detail on the fish. It would also be nicer if it was bigger, to get a better feel for the image.
8 - Very nice, but I just feel drawn away from that for some reason. Probably because I don't like cats.
9 - My 2nd favourite. I love the colour scheme and the good use of contrast, but it all seems to be compressed and squashed together which looks bad to me.
So, #5 gets my vote.