Answer: The leaves on this tree are generally quite small, so I suspect the leaf size is normal, especially since the tree has grown so well. With regard to the number of branches, this tree can be a bit "shrubby" in form and some gardeners do like to thin it gently to create a more sculptured look. This would be done slowly and carefully over the years rather than all at once. Pruning, especially for form, is an art as much as a skill so you might wish to consult with a professionally trained arborist (tree specialist, not just a tree trimmer) on how best to train your tree into the shape you have in mind.
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