This is my first post here, and I'll admit, I'm a little new on the net, so please be kind heh. Anyways, Figured I'd try and do a piece of pixel art, its my first pixel art ever!!! its a rock! The purpose was to try and put detail into the wall and floor and such w/out it looking uniform, and also to do proper looking shading. anyways, here it is!

If anybody has pointers, that'd be great

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Also was wondering, is png a good format for pixel art?
l8rz
-defielxor