Mr Scott Robertson has a great channel on youtube, some excellent books and is a top rate educator.
I really love the skills he has, and just love his videos’s.
So, if you want to improve also, watch this, grab a pen, some paper and keep drawing.
By the way, check out my BOOKS board on Pinterest for a small selection of his and other interested reading material.
Also check out my ART board on Pinterest for Arty stuff which interest me.