ey dude. just checked out your sketchbook and I see you have a huge passion with doing art.
some tips, critique etc.
First and the most important tip is: LEARN THE CORE FUNDAMENTALS. These ones have to learn each artist if he/she like to be a pro in the future. The core fundamentals are: perspective, human anatomy and light/shadow!!! Totally necessary to create a piece of artwork/illustration full of epicness.
So you should start your own Study_Sessions (like I do at the moment - here: The Claybook V.01 to be motivated and show peepz your progress. Guyzz love it to see "befor and after..." work
well honestly I play with the idea to create a new blog where guyz who really like to improve their skills can upload their pieces and get critique/comments. but not sure if I should do that.
btw - keep up practicing dude