Not bad :)
I think the only problem with this piece are the arms. Although they are muscular, they are too small and short. Making them a little more beefy would up the intimidation factor and give him a larger, more menacing feel.
Other than that, I think you captured the essence of the creature pretty well. Good job :D
Now that I look at it i see what you mean. That's a very good point. :D
I like this. It does look a little... I dunno flat? I think it might be an overuse fo black. Also it could use a background. A background in my opinion would really improve the pic. The head also looks kinda merged with the torso. Otherwise I like it. Well done.
Yeah i see what your saying. I never realized how little his head stands out. This guy is just a quick 15 minute concept though, so theres going to be some imperfections.
but now i kinda wanna redraw him more detailed and less sketchy to fix the depth problems lol