cool m! ur getting a lot better and your playing with the opacity. you might try adding even more colors, like where the light hits, which appears to be the left side, you might want to make white, and then inward from there blend into the darker colors, making it look rounder.. :) but I think this is getting better and better. i bet you could be really good on here with some practise!
drawn in 7 min
drawn in 13 min