Which tree is like a leafy tent or umbrella? Its arms reach far and wide to bend over us.
Which tree looks like a spire? Its arms are raised toward the sky.
Which tree stands with trunk tall and straight from the root to the pointed top?
See "the brave old oak, with broad green crown and fifty arms so strong."
Paint a set of shadow pictures (silhouettes) of the trees you like best.
Study the trunk: its shape; its size; the way it sends out its branches.
Study the branches: their shapes; their length; the way they stretch out, or stretch up, or droop.
Paint the true shape of the whole big tree.