Amazing work Leonard!!
I absolutely love the subtle hue shifts you've got going in that middle picture, reminds me of how Christophe Young uses greys and greens to render skin tones. I also like what you've done with that last drawing - I gave you some feedback on the Discord and you've really nailed it! The arms, larger torso, and clear shapes of value really give it the readability it needed.
Fantastic work overall. Keep it up!