There may be a couple of other factors at play here in addition to what @nebulousflynn and @ssh4 had mentioned.
1. Have you applied an alpha mask around your subject in every shot? Most photogrammetry applications do not play well with a single color background without some sort of masking going on. That white background that your subject is standing (too close to) may be throwing photoscan off.
2. Your light source looks like it's coming form a single flash on your camera. This is a no-no. The reason being is that the shadow information changes according to each shot (compare the shadow created by your nose between two photos for an example). Light your subject evenly with no harsh highlights and no deep shadows for a slightly better result. It would be best to shoot outdoor on a cloudy day if you don't have the lighting equipment.
There are other things to point out, but eliminate the other variables for a start, then work your way up from there.
Remember that this isn't a turnkey, point and shoot process. There's a lot of elements that go into a good scan and it takes time and work to suss out the problems and get a good final result.