Something about form

[neopatogen]

I made another structure sketch digitally and then painted over it, though I changed the forms a bit several times at this stage.
@Matterfold thank you for the paintover and for posting your thoughts - I didn't notice the second source of light.
I tried my best to think about form/lighting, but in the very end I couldn't help painting some details without fully understanding their origin... I'll try to do more excercises and create a habit of right thinking :)