i wasn't looking for critique of such a sketch but i certainly wont mind it. you might find it difficult to point out all the mistakes though
I didn't intend to crit-rape it, just a few things that jumped at me when I saw it.
My main issue is the nose. Noses are difficult, especially for people that might come from anime-type backgrounds. The volumetrics of a nose aren't exactly something I have a mastery of (I tend to make way too many same-type noses, based on my own, as is usual) but when I sketched out the nose you had made (in the middle) various faults in formation became clearer. The biggest thing is when to show or not to show the nosetril connection to the face. I think it's a matter of from which level one looks at the face, but generally I'd suggest connecting nosetril-hole to the curve that shapes the nosetril, otherwise it just looks very odd. I have a good friend and comic artist that did what you did on this piece for years before he decided to study noses more. I hope the edit helps a bit. Furthermore, in the edit, check out the bright white under the eye-bag, it's one of these things that really make a face seem more alive if you add them. Furthermore, I added a few more light planes to the left side of the face, not strictly realistic but to help show the shape and volume. The left eye was too high I think. Then again perhaps not, I didn't take the tilt of the face too much into account. I added a flat light in the left side of that little thing we have under our nose whose name escapes me, since it'd make sense to catch light from the right-lightsource, and see how it helps define that area a bit more?
The main reason I wanted to critique the nose is that your avatar, and and two older pieces you had made had similar nose-problems if memory serves.
Larwick, it's a nice piece, of all the things I'd be careful with the gesturing left arm, as the wrist cannot withstand that placement.
