Howie's details - like the leaves and bark on the trees are swell, but they are subservient to the larger shapes in the composition. Post makes sure he arranges the biggest shapes in relationship to each other first: Tree, sky house, character, ground - all these balance really nicely against each other. Once he has that balance, he wraps the details around the larger shapes.In that big fat solid tree, you can see how the main shaft of the tree is made up of crawling, writhing lesser tubes.
He draws great little compact cartoon cottages too. - made up of 2 major sub-forms: a stone block topped with a thatched roof. Then the windows, doors, bricks, wood frames and such follow the positions of the major forms.
BREAKDOWNS OF HOW HOWIE ARRANGES HIS COMPOSITIONS