Good clear pictures for me are a must, but they have to be realistic, I see so many photographers now who's skill seems to be in photoshop rather than taking photos, editing skin to the point where it just does not look real, even changing whole bodyparts and slimming people down to the point where they are not the girl in the photo. If I only used selfies or webcam pictures I would not get the work I currently get, although I think a mixture of both can work really well, as people can see what you look like in pro and amateur shots.
When you look for a photographer make sure they have a good selection of pictures on their website in different locations, and dont over-photoshop their pictures.
As for social networking, other ladies say they get lots of work from it and wouldnt survive without it, and yet I do really well without.