Okay, you're doing a good job but of course. I refuse to lie, as stated on Light's profile page.
Visit it if you don't believe it :v..
Anyway, I think you could do a much better job if the lines are less sketchy. Currently it's way too messy. On the other hand, even though I'm not uber awesome at it either, you should work on those human anatomical characteristics standards. Well, thats all I have to say for now as your shading is awesome and everything else is pretty much in place.
I don't like telling sugar coated lies, sorry if this upsets you... :v
This is Kyuubey