One thing that never ceases to impress is a cool backdrop as well as a cool platform to put the miniatures on.
When I saw how a certain company selling minis take their product photos, I figured:
Actually it is DEAD simple to create your own "studio":
Photo taken with smartphone, effects (borders, logo) inserted with a photo editing app on the same smartphone.
And this is, what it looks like from 3-4 feet distance:
A printed sheet of paper with a backdrop Image scavenged from the Internet on a cardboard and the mini stands on a piece of fishtank decoration.