https://www.craftsy.com/class/improve-your-paintings-luminous-watercolor-mixing/
Improve Your Paintings: Luminous Watercolor Mixing | Craftsy
Mix the glowing, harmonious watercolors you want, every time. Learn how using fundamental techniques and a limited palette of just six pigments.
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https://www.abebooks.com/9780823044481/Pulling-Paintings-Together-Reid-Charles-0823044483/plp
Pulling Your Paintings Together - Reid, Charles: 9780823044481 - AbeBooks
Gives practical advice on using line, rhythm, mass, finish, style, light, mood, gesture, shape, and color, and offers critiques of student paintings
your paintingsreid charlespullingtogetherabebooks