Drawing practice: Growth in chair

[qzar9999]

Hey people. I've recently been studying and practicing drawing, trying to get better--I never was terrific in the first place, and I broke my hand last year so I hadn't in a while--and this began as an exercise in proper human body proportion. I know it's kinda rough (don't even get me started on the 5-minute background) but it *is* noticeably better than I used to be. I won't get any better if I don't practice, so maybe in a few weeks I'll take a cue from Kricket and set up a brief request thread to give me ideas. In the meantime, check this out and let me know what you think. I'm looking for opinions and criticisms, preferably of the constructive variety.

EDIT: Fixed version. Drawing lines darker, paper lines gone.