Jones Sketchbook

[ImSkeptical]

Maybe try be a little more conscious about your edges? Things like the hair can go pretty soft and more clumpy. If you want it to be all stubbly try changing the hue abit as well, bit more towards green. That change is probably more important than the hairs themselves. Also maybe try experimenting with reflected light, or a secondary light source?

Got some nice improvement over your sketchbook though, lots of hard work too xD. Keep it up