Another helpful digital ploy to assist "seeing" values is to use the "color reduction" feature. I like to reduce the color image to 10 values, and then convert to 8-bit greyscale. You get this admitedly odd "relief map" of the image, but it does help jump-out the plane transitions. It's then very easy to see your brightest areas and your darkest. Obviously, reducing a complex color image to "10 tones" is hardly an adequate final reference for a painting, but it's a great help to isolate values before you go too far in the wrong direction, as well as a measure to be sure your tone-balance is basically in-line.
Rgds,
Dave
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