Watch the following two videos and note techniques in brushwork, variation in tone, opposition of large strokes with detail strokes, and the beauty of the composition in the last one (comsider the arangement within the area on the page and the use of space, movement into and around the picture plane.)
Comment on brushwork and technique in both, the use and importance of tonal variety, the purpose of large strokes with detail strokes, and also comment on how the Chinese artist creates balance and interest in the composition (how does the artist draw your interest in and carry it around the picture plane.)
Spend an hour drawing a variety of different kinds of trees from observation from real life, not photos. It need not be a composition or scene. These are studies of the structure of trees. You may need to use several pages.