@seiseki: Wise advice, I'll keep it to heart. Technically, there's no way to get worse by practicing anyway.
So I haven't found a system which I find appealing or which is explained in a way which is inclusive to me yet. So I'm going with the advice of building anatomy from basic shapes for now.
I'm practicing drawing shapes an hour a day. I could invest more time but I don't want to become fed up with it so I'm starting slow and consistent and see where it'll take me.
This, I think, is my best one so far:
I find it still lacks volume however. It still comes across flat to my eye but I don't know why! It's drawn 210 spheres but I'm still having trouble getting the depth across.
What do you think? I'm really, really, really interested to read why.