A small kit of tools for the fundamentals we work on together — first how light models form, then how to read value and chroma under any colour. Warm-ups for the pieces we paint.
Every subject reduces to these forms. Rotate each one, move a single light to see how it models the surface, then download the model to set up your own reference.
Read value and chroma the way pigment actually behaves — the Ross Pope scale for judging value under any hue, and the chroma ceiling that decides whether you lighten a colour or build its shadow.