First I want to thank Idiot Apathy and MattGamer for their comments!
Matt: I think I see what you were saying about the deformation; it is caused by the quick transition back to light on the shadow side. The fill light is too strong, nearly as bright as the key light. It could probably be fixed by darkening the bounce light, and lightening the shadow too. Idiot Apathy: I like how you put it "...a white light with extra yellow." That is just what I meant by 'pale yellow' except your way sounds brighter. You are right also, white light adds to all colors equally, except when they reach the maximum we can see. Then the color values will start getting closer together = less saturated/intense at higher values. I try to paint in a medium key of chroma (from Ron Lemon's color theory) so I get a decent range of intensity, but then really saturated colors look out of place. Maybe I'll try something high-key in a future exercise. Hope I don't sound defensive having an answer for every comment, I will definitely try to put your advise into action!
Good job on these, especially on going back and redoing it to get it right! Though... I think your first attempt looks very good. How did you convert these to greyscale? It might be a trick of preception, but if anything the green sphere looks brighter than the grey. Your reflected light looks better in the second one though, and you had much smoother transitions between value areas. In the first one you were getting some of my deformation in your shadows.
Edges, value, and deformation:
From Ben Mathis
Painting with compliments sounds fun, how exactly would that work?