You're getting better. Just keep paying attention to that line quality. If you're concentrating primarily on making a line drawing, don't worry about shading in large black areas (especially if all you have is a fine-point pen).
Dude, you're really tearing through some studies - I am going to try to motivate myself to take such a dilligent approach to figure drawing. You've come a long way and there's so much character in your drawings. Are you hoping to be an animator or something of that nature at some point? Minds like yours, given the right tools and time, are incredible to be in the presence of.
Thank you for stopping by my sketchbook and taking the time to comment. Keep up the great work.