We arrived at LAX an hour and a half before my flight yesterday, so I painted this study of the aircraft at the gate. It's about 5x8 inches in a Pentalic watercolor journal.
I used just four colors: white, black, cadmium yellow deep, and ultramarine. Those colors gave me a complementary gamut with warm and cool contrasts, and an interesting dull green.
To see a detailed step by step, with all the stages of this painting, check out my Facebook page.