Hi Matt
2 megapixels....more the better
macro.....dont be fooled by the super close up macros..that close to the figure you will get shadow from the camera over your mini.
tripod......
timer function......gets rid of shake from button press.
dont forget usb so you can get the pics onto PC then a decent editor,Photoshop=the best but costly.....Paint shop pro....I use it....still costs.......Gimp.....free to download and a lot use it.
EDIT.....specific camera depends on what cash you have to spend.
What is your budget??