This is my 5x7 sketchbook. Should have worked much larger to give myself more play room. Interesting concept. The color diamond of fully-saturated color comes from Chris Carter's lessons here on Skill Share. Very helpful. I tried this technique with another photo, but I obsessively picked it to death. At least, it has vibrant color.  Tried a 11x14 weight lifter - closer to the right technique, but missing some color. Green maybe?It's 8x10