This is one of the few before/after meme's that shows actual progress in relation to the 'before' style and execution. The 'after' shows much more realism, mostly through anatomy placement and proportions, though this could be just a shift in style as the 'before' leans more towards a comic style which often deviate from concepts of realism.
One thing that cannot be argued is the obvious increase in line efficiency. Your lines are much more purposeful and a majority of them help to communicate something in the painting.
I've been watching you since 2011, and you did improve, but you kinda started drawing the same faces for the characters. I think thats the difference between 2009 and now. your colouring and lineart improved a WHOLE LOT.
I like this one alot because they look like they were drawn by two different people! The stylized look of the first one is really cool like a a comic book or something and the second one like more professional. I DONT KNOW WHERE IM GOIN WITH THIS