Rui:
First, Welcome to SOG, hope you enjoy your time here.
I was wondering what your specific goals were out of this underpainting. Are you interested in trying a value-based underpainting approach like a grisaille or verdaccio? Or, are you more interested in underpainting as something to lay in the basics of the form so you can get right into color?
If you are looking at a value-based underpainting approach like a verdaccio or grisaille method, then your values are far too light in the face and you should be shooting to come closer to this:
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