How much is a free lance model's income?

It can be however much the freelance model chooses to make. There are no hard and fast rules as to how much a freelance model can charge. If she/he is very experienced and has a strong portfolio of work, then she/he can charge more along the market rates. Inexperienced/new models will more than likely have to charge lower fees and/or do test shoots until they can build a good career.