His eye is massive! No, I kid. It's very detailed though.
Mm. His eyebrow should be almost as long as his eye is, and make it just a tiny bit thicker so the eye doesn't focus too much on his eye.
His head a little off, round the top part off a bit more.
Other than, it's cool! Very original with the symbol. ^^
really good, maybe about the eye though you can look up some face drawing tutorials on DA, the eye itself is good just oversized
Neck should be ticker.
Otherwise, it's alright.
Personally, I'd draw on white paper; no lines. Sometimes the lines throw me off. Maybe draw the head a little smaller and do all the details smaller. Sometimes, a body really accents the whole thing. xD; GJ, though.