The next person who says they suck without giving a reason is officialy a morron. Not that the people who said it before aren't.
"They suck! Omg!" etc isn't helping him get any better. For all he knows you can't even see the sprites and could just be saying they suck.
Now, you need to read a tutorial about recolouring because these are quite bad and if you can't recolour to even some extent then you'll never get anywhere in spriting. the one major tip I'd give you is to recolour the outlines properly and not destroy them.
Never save as anything except .PNG and .GIF (ONLY WHEN USING GIMP OR ANOTHER TRANSPARITISER!) and NEVER use default paint colours which it looks like you may have done.
Oh, and there's sonething about the second Tyranitar and Dusclops, like they used some advanced tool to make their shading blurry or something.
