Toy model for exploration, not clinical. Mood m = (valence, arousal, dominance) follows dm/dt = -k(m - b) + g·(tone - m) + noise, where b is the stressed baseline and tone comes from your art: brightness and saturation map to PAD with the Valdez & Mehrabian (1994) colour-emotion regression (P = .69B + .22S, A = -.31B + .60S, D = -.76B + .32S); stroke speed adds arousal, smooth strokes add pleasure. The map is Russell's valence-arousal circumplex (1980); dominance is shown as the dot's size and the bar. Drag the green goal ring on the map.