A single minature that can range in size from tiny upward to the size of a demon prince. It is not restricted by a gaming sized base, but more on the precieved look of a minature. Mounted models fit this category, but keep in mind it is single miniature. For instance, a mounted knight fits, a mangler squig with 2-3 riders would belong in the monster category. 

Anything that is bigger than the single miniature category fits here, as long as it is organic and big.

Vehicle inclued all kinds of games system and time peroids, and scale. It can be anything from a WWII tank, to a Warhammer Steam tank or a futuristic robot. 

Unit or warband consisitng of 3 to 10 models. No game restrictions in terms of what could be considered a unit. If you have 3 models that fits togheter they are elligable for this category. It is optional if you want to enter the models on their supplied gaming bases or if you want to make a more scenic display base

Diorama can be anything from a small vignet or scene to a large battle. Any scale, game system or historical diorama fits this category 

This is the category for models of a larger scale. Typically busts, 54mm or larger or scratchnbuilt models that does not fit the other categories