I start my paintings several different ways, sometimes even with a white canvas, but mostly doing a value study with burnt sienna or transparent red oxide. I do a very loose drawing except for architecture or the center of interest. Once the three value work is finished I go back and emphasize darks using a mix of Ultramarine blue and burnt sienna, my accent dark. Plus I wipe out the lights with a paper towel and oms.
Premix the colors used in the painting and try to follow my rule of having darks across the top of palette (accent dark in top right corner), tints on the very bottom and middle values in the middle of the palette. There is also attention to warms and cools. I use these colors as a starting point and continue to mix for variety as I go. That is why the palette looks so messy, but organized if that is possible.
Apply blocks of color all over.