Hi Karin,
Actually, I was using this watercolor on Acrylic Gesso for landscapes. Today, I tried to do a portrait, but found you're absolutely right. It is close to impossible to do detailed realistic work with this technique unless you keep spraying each layer with acrylic varnish as go build up. Otherwise, every subsequent layer tends to completely erase the previous. I had a little better success using soft sable brushes, but it was still too difficult. So, I've given up on this technique. I'm going back to water colour paper I think.
Anyway, here is a monochrome drawing I did from a photograph using Conte A Paris. Essentially, it allows infinite editing. I don't use white at all. Instead, I use several erasers, to lighten areas or put in highlights. I hope my drawing is correct enough. Give me some input on how to improve it. The photograph is not taken by me, otherwise, I would have lighted it differently.
Tarique
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