Hello,
You are off to a great start. I especially like your understanding of the third dimension, good for you. Practice, fast and slow, is the only way to improve. Have you ever tried contour drawing? A famous teacher, Kaimon Nicolaides, wrote a book called The Natural Way to Draw. if you can get it and practice his many exercises, you will see yourself make progress.
Hi, It looks like you have lots of talent and that you are improving although you may be too close to see it. Give yourself a year or two and you will be happy with where you are.
Do you follow Will Weston? He is a great teacher and could inspire you. Also, do you do contour drawings? They might add to your gesture work.
Also take a look at Jeff Watts' videos. Then there is the free Andrew Loomis PDF book on illustration that is a classic.
One book that is very good for beginners is Nicolaides The Naural Way to Draw. It is old but the methods are still used all over. You can get a copy on ebay or Amazon for very little.
Good luck!
