Nice gestures! Keep going. I think that using line of action will help a lot making it stronger. I learnend that from watching cartoons and the preston blair book. I now try to apply that to my own drawings.
Just got to know this site today and started using it this evening to warm up for some personal work. I'm a 2d artist doing mainly cartoon art. See this link for my animal studies. I did this because I want to get better at drawing animals.