not bad overall
what i don't like
-his skin color, way too pale and generic. with so much grey in the piece, his skin stands out way way too much
-the shadows on his face, he doesn't need a shadow for the lines under his eyes, they aren't THAT prominent; his nose all around looks terrible, the pig nose and heart shadow looks meh. put a deep shadow over his entire face, give him some menace
-lens flare on his headband is a cheap way to do it, look up some tutorials on coloring headbands, there are a lot of good ones
-and finally, the background is really unnecessary, way too distracting, just leave it plain or throw the uchiha symbol back there or something
-also looks like he's wearing makeup, but only on his right eye