30 mins class

That is a very nicest sketch you've got there, technicssb440. Very good sketch.

If I was to suggest an improvement here, it would be to focus on the overall proportions of the legs. The reason why is because,you could check out this link, and this too. They can help you out on your understanding of leg anatomy of the human form.

Hope it's been completely and definitely favoring.

This figure and the others you have done are a good start. You need to work on hands and feet. Line-of-Action has a section on hands and feet you should avail yourself of. Also, the internet has a lot of information on this subject. Good start on your figures that you use to build on. You can get additional models (free) from On Air Video. Also, you might want to investigate the following book:

"Morpho: Anatomy for Artists" by Michel Lauricella

I love the 3D shape of the ribcage you used, and in general your lines seem to be confident and make nice shapes, particularly around the arm and chest.

I'd say keep an eye on how the lines of the back come out from behind the arm. It's easy to accidentally make the back too flat when you don't see much of it but there's a lot of mass back there. The figure overall seems long, but it's hard for me to tell without the reference. Tilting the paper towards you so you're seeing the drawing with less perspective can help mitigate that, if you're not doing it already.

I personally don't focus on hands and feet much with 5-10 minutes studies. The most I do is make a mitten with a thumb for the hands, and the ankle + heel with a sock shape for the foot. Hand and foot detailing is more for when you have the rest of the anatomy down pat.

It might just be personal preference, but I also work smaller when doing 1-10 minute drawings. It's easier to look over the whole thing and find mistakes. I can fit about ten 30-60 second drawings on an 8.5 x 11, three 5 minutes, and one or two 10+ minutes. BUT if you feel more comfortable drawing large, all power to you! That's just how I like to do it.

This seems to be a large sketch, and I wonder does it not create a tendency to make long narrow figures (It is a problem I have) and I think the torso and head should be a bit shorter, and maybe also more fluid...