Haha thanks. As for going into manga, I don't think I'd too well. I get lazy and don't take all the detail that needs to be taken. Sometimes I go the full way (in this case with those muscles) but usually I just laze around.
Anyway, some tweaks to the two pictures:
Shaded hair.
Thought the back was a little empty so I wrote something there and hope I wrote it right.
Redrew a part of his arm.
I
think this makes it look a bit more realistic, but only a tiny bit.
New pics:
Quick doodle in my Geometry class
And this one