Re: How to paint over a Grisaille underpainting
Mimi- no, not necessarily. Glazing over a grisaille used to be How Things Were Done until the impressionists rebelled. These days you'll find both approaches, though I think more people are using a direct painting method rather than glazing, or "indirect" painting.
The artpapa site is very good, but IMHO a little bit overkill. You don't have to wait 5 weeks between layers, a few days will suffice. Also, there are a few layers you can skip.
Lady Mars Orange Marmalade Stapleford
http://stapeliad.blogspot.com ......... Be yourself. Everyone else is already taken. -Oscar Wilde