WIP - character face - style study - 3Dsketch

This is a WORKINPROGRESS I'm trying to define a personal style. First of all I'm an illustrator, so I'm trying to make my drawings alive.
What do you think? I'm looking for some advices before go on :) so leave a comment if you want!
Then after finished her, I'll create a complete project here on artstation. Thank you!