Kevin Macpherson walks through the magic grid method for landscape painting: draw a grid over your reference, place your darkest dark first to anchor the value range, then work through each form with observed colors. Treat it as color notes, not perfection.
Chapters
I'll put a picture here of what that looks like. And then after drawing the grid, we use that grid to guide our composition as we draw our subject lines. So whatever we're looking at. And then after you have both your grid and subject lines, you start with your darkest dark on the grid space to serve as the floor of your value range. So competing darks and darks will confuse the viewer. So starting with and sticking to just one can help guide your painting. And after that, you walk through each form selecting the color that you see, or maybe what you want to see. The light changes so fast, so this can be really challenging. And one of the things I really liked is Kevin recommended to avoid getting frustrated, just consider the painting like, I'm just taking color notes of the scene to show my friends the beauty that I saw today.