I'm guessing that you looked and admired Uwi's work some bit 'cause you drew your legs and feet in a similar way xD
REDLINE 8D
(you can see that I have gorgeous handwriting xD)
Also, I think you should block in with a brush that doesn't have opacity jitter on. You can see that your things are transparent at some parts :<
Your light source is also a bit inconsistant. Don't threat too much about it though; shading's pretty hard to master in the first place anyways. I like to draw a lamp on my thingum (paper, canvas...) to help me remember where it is ;D