Tito,
I have to agree with Karin.
The monochromatic underpainting is used with both glazing and opaque application of paint. Since flesh tones contain so much white, glazing them is not a very effective way of proceeding. As I indicated in a previous post, glazing is most effective with darker transparent or semi-transparent colors.
To your point about glazes darkening the area, you are correct that repeated glazing does darken the passage. If I have a passage that I intend to glaze more than once, then typically I will raise the value of that passage by 1/2 to 1 full value in the underpainting to accomodate the glazes.
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