Life Drawing Tool

So I was shown a handy online life-drawing tool a while back. It's meant to simulate a real life drawing class except you're drawing from photographs instead of live models. It's not ideal but it's great if you don't have the opportunity to go to the real deal (or you're lazy like me).

Here's what I've come up with. These range from about 3-10 minutes.

 You can try it for yourself here.