The advantage of taking pictures of the famous is that they get published.
Making books is a very specific kind of activity. It's not really a collection of your best pictures - although it is - but it's also a way of presenting your work so that it's not repetitive, so that it flows, and so that it makes sense in a book.
Professionally I've evolved with what's required, but the pictures I do for pleasure haven't changed, except for the cars in the background, the clothing. I haven't changed at all.