A cast shadow is actually a good idea, and you're def right about the jaw!

Amazing pixeling =)

If I had to nitpick, I'd say the action isn't obvious: is it reclining or jumping? I'd go for reclining, but a subtle cast shadow would clarify. Also the jaws perspective looks wrong, maybe because the lower fangs are too far apart.

I can see the inspiration - that's some great work.

Thanks everyone! I'm honestly kinda surprised this got as popular as it did! Maybe I've just been staring at it too long, haha.

I love the thick outlines.

And his name shall be Rocky III

It looks kinda creepy, especially the yellow eyes. I like 

While I dislike the eyes, the fur and the rest looks really great. Well done.

ya.                                                                     

This is so fantastic that I'll be looking at it for a long time, trying to learn all there is to learn from this incredible work! A sure "top 10 of the month" piece!

When I looked at the preview my mind was already drooling from amazement.

Kitty's not happy.

very nice style! but I didn't like the ayes too much 

Simply awesome.

As I said on dA, this is fantastic.

I was amazed to zoom in and see how few colors and how little AA was at work.  This really does not "look like pixel art" in a way that's simultaneously strange and impressive, especially when you see just how tightly controlled it is on a pixel level.

Oh, this is good. Looks very smooth for only 6 colours. Nice AA.