How to Draw Trees - Conifer drawings by Claudia Nice
Simple drawing game- draw some geometry trees - from Tangle Art and Drawing Games for Kids book-interactive board?
What magic there is in simple black and white. Three sketches from Drawing with Pen & Ink by Arthur L. Guptill, the first by the author, on trees, the second by Schell Lewis, and the third by Joseph Clement Coll:
create a one point perspective of a snowy wood and read the robert frost poem or grade