Since this contains some hand-drawn artwork I shall let it stay here. :) It might be an idea to post your sprites/trainer card in the Pixel Art and T-Card Discussion threads, as you'll probably get more feedback there.
Your unicow is a very cool concept, and very original! ^^ I like the bright colours you used - it sorta looks psychedelic :D I think your pictures could do with a bit more shading - they look a bit flat in places, but you're off to a good start! :)
--FG