I've taken a few classes from Mira M. White in the past and she is an excellent art instructor and artist in her own right.
If you look at her website, you can see the luminous glow that her paintings have, and in her classes, she shows you how to achieve the look and texture of her painting style. I've taken her Watercolor Workshop and have attended an art opening of hers. Her paintings are beautiful and complex.
Her style is "pouring" watercolor and she is also very skilled in dry pastel and oil painting. She teaches classes in all mediums.
She teaches all around the Bay Area, and has special sessions at the Mendocino Art Center a few times a year. She is also teaching in France next summer!
She is a great teacher as well, she guides you into the feeling of painting rather than simply telling you what to do. With Mira, it's all about the feeling rather than the technical aspects of painting.