General info

There are no certain criteria for models but still there are worldwide known standarts:

Women:
Height: 5ft 8in (178 cm) or taller
Weight: 7.5-8.5 stone (50-55 kg)
Measurements: 34b-24-35 (75b-61-89)
Stock size: 8-10

Men:
Height: 5ft 11in-6ft 1 in (178-180 cm)
Weight: 11-12 stone (70-82 kg)
Measurements: 40-32-38 (102-81-96)
Stock size: 40

Do you resemble (look like) any of the models in the fashion magazines?
Do you have clear, evenly toned skin?
Do you have even white teeth?

If you have answered 'yes' to several of these questions then perhaps you could become a photo or fashion-house model.
If you are shorter and heavier than a stock-size model, you may fit into a more specialized market, such as full-figure modeling.
Do you have beautiful hands? If so, perhaps you could become a part model.