Hm... I drew this too. First thing that strikes me is leather, it doesn't look too good. Don't be afraid of darkening a picture. Train more on drawing hair, it's not this hard, especially straight hair like his
I've always struggled with hair. I hope I'm getting better. The leather was an experiment that failed. I started it and then read an article on one way of drawing leather (score the paper with a needle and then draw over it), I should have practised first.