A tiny lighting demonstration for the anon. I’ve marked the major light sources. YELLOW is the strongest. PINK is the same as yellow (the sky, basically), but it’s coming in at a steeper angle, so it’s not as strong. The place where pink and yellow meet is where you’re most likely to find the “natural” color of the person you’re painting. Forehead, collarbone, on either side of the bridge of the nose, etc. The BLUE is the reflective lighting.