Watch the following two videos and comment on techniques in brushwork, variation in tone, opposition of large strokes with detail strokes, and how the second artist creates balance and interest in the composition. (Consider the arrangement of form, the use of space, and the movement into and around the picture plane.)
Spend an hour drawing a variety of different kinds of trees from real life observation, not photos. It need not be a composition or scene. These are studies of the structure of trees. Color is optional. You may need to use several pages for your sketches.