A Quick speed paint sticking to just 4 values. Updated a bit with a blended version on the right though, which was about 10 or 15 minutes blending.

But referring to the one on the left. I think that’s  how you do it right? But it seems odd not being able to blend, but if you blend then it’s going to be more than 4 values , so I guess the point is not to blend in a limited value study right?