Choose the tree species and season
Observe the tree’s shape, trunk, branches, and foliage
Sketch the basic structure lightly
Block in the trunk and main branches
Paint the largest masses of leaves or needles
Add midtone colors to define form
Paint shadows under branches and within foliage
Add highlights on sunlit areas
Vary brushstrokes to suggest bark, leaves, and texture
Refine branch structure and edge quality
Add ground shadows and surrounding context
Adjust color balance and contrast
Let layers dry before adding details
Finish with small accents and final highlights