The eye and soul are caressed in the contemplation of form and colour. The subtle changes of colour over a surface - transitions that are like music - are intangible in their reaction upon us. There is an immediate sensuous appeal!
Art is a thing so much of the imagination, of the soul, that it is difficult to descend to the fundamentals of technique and yet make it plain to the student that these are but the 'means' and not an end in themselves.
You will learn to paint trees only by understanding them, their growth, their nature, their movement - and realizing that they are conscious living things. A tree seldom if ever encroaches upon the liberty of another tree. It never wastes its growth in unnecessary twistings.
Do not be afraid that too much labour over the composition is going to kill the spontaneity. Those who absorb and digest their experiences are, of a sudden, mountains of strength and can produce pictures with spontaneous start and finish.