Quick Sketch - Bulk Biceps

I think it's high time I get back into the swing of things! Here's a quick (~20 minutes) sketch of Bulk Biceps. I'm going to try to do little sketches like these as often as possible. 
While I may not upload all of them, I think it will help get the creative juices flowing. It will also help me learn to let the little imperfections in my drawings go (I'm a huge perfectionist) and speed up full compositions. If anyone has any feedback or suggestions for future sketches, I'd love to hear it!