this is amazing * - * i like the 2nd and 3rd one, i think counting anatomy and geral shading and such the last one would be a clear winner, counting just overall line quality and such the second one would probably be best overall.
they're all great i think anyone would be happy drawing as well as you c:
You can tell 2013 is best because the style is much more streamlined. You can tell that you're really comfortable with the style whereas the 2011 you can tell that you're still improving. Great perspective too!