CAN'T YOU LOOK AT THE SIMILARITIES?! *Caps lock off*
That second sentence really makes you look dumb. The green dragon's head, the dog, and the moss creature are stolen. Even if you made them, this is concept theft. And copying sprites into paint and then making them a bit different is also theft. Also, your "evidence" doesn't prove anything. You can easily take a sprite and then take the colors away, downgrade the shading, and erase some parts of the outline. And I agree with AA; Your spriting skills fluctuates pretty drastically. Take the Shaymin sky form for example: It sucks. Then look at the dog: That one is good.
And @mods: why solve this via PM? It doesn't solve anything. The thief will ignore the PMs and he will admit that he stole a sprite.