10 entries my eye, that's a scare. They're all good. People would not mind working a bit more on their works.
I like #1, I obviously recognize the style and know who made it. Nice work, but a little more detail and lighting could play IMO.
#4 is good, I can guess who's it is!

Nice work, but not properly textured or composited. Too much flow of needless effects, but the colors and idea is very nice. Have to credit the person for that. (y)
#3; You know, busy man.
#5; Nice texture at the back, but the render work could've been better. Too much empty space after a particular portion of the image.
#7; It is nice! Perhaps the one wallpaper that has got THE potential. But the blending, lighting and some more related Pics at the back and stuff could be better, if it was, it actually can win the competition by no surprises. Nice effort, just need some more reasonable detail next time! (y)
All are good imo, the efforts show. Hope you guys get a good run with the votes this time!