/ic/ - Artwork/Critique

I am having difficulty selecting colors and then making tones and tints for them based on different light sources. I'm not sure how well my forms are represented, I know that some of the shadows and highlights are in the wrong place, so something like a redline could be useful. I initially had no linework but it looked embarassingly choppy. Just any process related comments or resources or exercise suggestions so I can get to a level where I can finish the render without linework would be super helpful.