I'll tell you this: work your angle. And plan ahead what you want to capture have a glimpse, a hint of knowledge regarding what your client wants to have... Everything else in photography is just an undiscovered land you can play with.
 One of my unsurpassed  masters Jane Bown was taking pictures always almost at the eye level of her model. This gives a feeling of intimacy we all like so much.

Find more on my baby & kids portraiture photography