Today I started with a layer of neutral color on my postcard. I created this color by mixing Magenta, Turquoise and Nickel Azo Gold, and White.
I liked to start with a neutral layer, and I was surprised how well the top layer with patches of collage paper that were made from bright colors only (no mixing with white, no mixing with each other, only glazing). Interesting experiment. It is going to make it to my online course, most probably.