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Dear Joan:
I guess the question is, how close do you want to follow your reference photo? If you decide to lighten up the whole head, then there still should be a correct relative tonal relationship at this stage.
The tonal integrity of the underpainting should be your first priority before you even think about glazing. Glazing should be seen as a way of adding color, as opposed to a solution for achieving plasticity.
My advice to you is to spend as much time as possible getting the value relationships correct on the underpainting. When you finally have the feeling you can almost put your hands around the form, then you can begin to add color.
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