Cipher Studio offers some tips for creating good photographs of miniatures.
Uncle Cheddar has an article on taking miniatures photographs. One very good piece of advice: Fiddle With Your Lighting, Not Your Camera Settings.
Here’s another guide to photographing your miniature wargaming figures.
Taking professional level photographs of miniatures requires the use of a light box. Here’s a tutorial on building a cheap light box from a cardboard box and tissue paper.
For photographing miniatures, your best option is a lightbox. They’re expensive to buy though. Fortunately, you can make an inexpensive and effective light box yourself.
I made one out of white foam core.