Wow, GREAT stuff, Jazz! Those gesture drawings have so much life. The first couple of pages (probably the 30-second or 1-minutes?) convey so much with so little. It's awesome that you're taking figure drawing. I envy you a little.
That colored character looks pretty good, too. You're right that you should be focusing on your drawing right now, but I don't want to discourage you from having some fun. The shadows are a little indistinct -- maybe do some study on the planes of the head, and draw some geometric objects, focusing on how the shadows fall, and where they're cast. Learn to make your stuff feel SOLID.
This was a great update -- looking forward to more.