Here is my go at the last 2 layer assignments. Done in Procreate. This was exactly the lesion I needed to push myself to use layers in an efficient way. I'm still super slow at it though.

I had fun with a more painterly brush for the skin. Never tried it before. I think my piece has way more contrast. Kind of harsh.

My 1st attempt. I think I made the feet and hands a little too big.