For Ohu

I found an old picture (according to my computer it's over two years old) and decided to finish it. It's John from Ginga Nagareboshi Gin. I watched the anime ages ago. I wanted to draw one of the characters just once. It also was surprisingly hard to find good reference pictures for John. It seems to me like the author can't decide what markings John has ಠ_ಠ
I'd love to get feedback and suggestions on how to improve my drawings