Here are a couple of pictures showing my photo setup:
The Top light gives a nice overall lighting of the scene. The lights in front are at the same level of the miniature. This allows for all the areas to be filled in. I wasn't using any reflectors or anything to soften the light so I simply pulled the lights further back. This allowed it to diffuse a bit.
Here is a different view.
I like to separate my background from the miniature enough so that I get a slight blurring of the background from the depth of field.