I like the waving Pikachu. His crooked smile ish cute. ^^
Yeah, and don't feel bad about not getting noticed. Perhaps you can comment on other people's art and that way they will be more apt to commenting on yours.
Mudkip's alright. I like the shading on both it and Voltorb a lot. Though I think Mudkip's right arm (its right) is a little funny looking. But other than that you're tons better than me trying pixel art! *shudders* Mine always look so... yeck...!
Keep up practicing and you'll probably get loads better!