First of all, I apologize if I (will or have) offended you in anyway. But I'll be frank with you (really frank with you):

1. An anime character's facial features are usually really sharp. You got that point right, yes, but the sides (near the ears) could be slightly narrow to give it a 3D look.
2. If you want the hair to be as natural as possible, don't keep it straight. Don't line it that way. Make it as messy as possible.
3. The eyes are alright, but it'll be nice if you can add more "eyeliner", give the guy some eyelashes too.
4. The eyebrows should generally be thicker (not 1 line).
5. The nose can be taller, it's like make up, giving it a slight shading can make a person's face look 3D.

I can give you an example by drawing a simple sketch out. Just find me or reply to this comment and I'll help :)

If you want to get some sweet manga going watch youtube videos by Mark Crilley
He explains how to get everything right and he literally shows you how to do it

The hair should be less flat I think, and the face a bit thinner when you take in account the eyes you drew.
Other than that, the proportions you drew aren't that pretty good :D

Well....................................................................
The head is a little hard to imagine as an actual head....... did you try this head on with no concept first?
But all over you'll do fine!!