/ic/ - Artwork/Critique

I got 3 black prisma color markers with my gray scale set, so I am just bleeding them dry

No faces today just values, picked some easy references to practice.

>top left - practice
>bottom left - traced it + values (ignore alien face)
>middle - used 3D printed pikachu as light reference - seemed like a good idea at the time...
>right side no practice, balls to the wall
>used a mech ref from Jake Parker

Could someone redline where the values are supposed to start and end? I feel like some of mine are off, but I can't visualize it.

Also how many steps should I be learning with? I am using 20%, 50%, 70%, and 90%