its good
I like the colors and the artwork of this piece but there are very small imperfections. Beginning with his hands. The left hand isn't a big deal since it is concealed but the right one looks terrible.I think you should have removed it completely and covered it somehow or had his hand in a complete fist, covering up the fingers. I think the smoke could have been a little better and less dense. It seems to completely take away from the character itself. Lastly, his bicep looks ridiculous. It looks as if you placed a large pack of smokes or a square on his upper arm instead of a muscle. To fix that I think you should get rid of the hard lines and dark shading around it, especially near the top.
After all this issues though, this piece is very cool and I love the comic book style.
One last note, I can accept that his leg disappears behind him because of the perspective but his left shoulder looks too bulky and unnecessary after further inspection. I think you should have just left the shoulder plate on the left arm to match the right one. Great job though, keep it up.