I agree with the other posters that hair type isn't that important. Texture and porosity are the most important. But just for fun, I'd say that you're a 3b. And yes, 3Bs hair tend to loosen as the hair gets longer. In a short bob the curls of a 3b would appear much tighter than they would at shoulder length. By the way, your hair and you are very pretty.
3b/c, medium-coarse, low porosity, high density
HG: Jessicurl Too Shea and Kinky Curly Curling Custard
Shampoo: nonsulfate shampoo and Suave Naturals sulfate shampoo when needed