My 8 week painting class started yesterday, this is the demo I did to show my process. I used 2 brushes, each 2" wide. They are the type with the short handle and wide ferrule, like house painting brushes. One brush for used for the pinks and reds, the other for the greens and blues. There were a few times I was tempted to use a smaller one for the details and highlights, but for the sake of the demo and to encourage students to try working with larger brushes, I didn't. It took a half hour from start to finish, with a lot of stopping for explanations. I did 4 b/w value studies of this setup, and randomly chose one of them as my guide for the demo.
The only reason I can think of to paint fast is that there is a certain gesture and economy of brushstroke that results in an energetic and lively look. When I tickle and fuss with a painting for hours or days, it looses this quality. The brushwork gets muddled and overworked, the colors lose their zest. Not to mention that when you go over the same passage several times, you start getting a built up texture from the underneath acrylic brushstokes that have dried, and sometimes that texture is unwanted. When I feel my paints start to get sticky, I know it's time to wrap it up.
