@dick,
I try to "master" as many different styles as possible in my free work (which I normally post here) commercial work is often or less interesting or not sharable because the products for example are not yet on the market.
Normally a client will approach us for a certain look from my portfolio (
www.frankdoorhof.com/portfolio) and ask me to recreate that for their product.
And sometimes (which I prefer) they just give me the free hand, we recently started an advertising assignment for SYM scooters in which I can just do what I want within the borders of the client wishes of course, but these are the nice and not so regular assignments, most of the times they just want look this or look that.
Which in fact is almost copying yourself.