well
to be constructive:
for your first real attempt, it looks pretty good. but then again, there really isnt much to it. a few minor redesigns of sonic and knuckles. they arent even vectorized. backgrounds are all lifted from video games. you yourself didnt put much serious effort into the creation of much of this imagery. however, for a first attempt, its looks good, and the 2.61 you currently have is pretty damned good for a first try. most get blammed off the face of the planet