In "How to Paint and Sell Your Art," Marcia Muth has written a book for both the beginning and the more experienced artist. A practical and useful guide, it is based on actual working experiences in art. For the beginner there is information on supplies, equipment, studio space and how to start that first painting. Chapters on pricing, exhibitions, galleries and agents answer questions for the more advanced artist. * * * * Marcia Muth, a successful self-taught artist, has exhibited throughout the county. Her paintings are in private and corporate collections and in the collection of the Museum of New Mexico. She is a graduate of the University of Michigan.