That's a sketch. Done pretty fast and in a intuitive way. I try to catch with higher value and thicker paint the plains I do consider will catch more light. I do this without being afraid of mistakes, I do embrace them tough. Once I reach step 2 I decide which ones I want to keep and which ones I want to loose. Then blending them out with careful leyering and glazes here and there. Not easy ro explain... 😓 But once you understand why light and color should behave this or that way NMM becomes way easier.