Here are some results of the scan taken. (I also did let her make some funny faces for later on )

As you can clearely see the disadvantage is, that the scan only works within a range of 180°. And it isn´t that precise in detail since it is after all just a mix of a planar projection of black(shadow) and white(light) lines onto the subject which are then measured in its deviation by some capturing device. you can clearely see the rasterization on the geometry surface. but its just ok for my purpose since I´m most interested in the bigger image concering correct proportioning of the head.

the scans are now used like 3D foto reference. I´m going to block out my raw model on top of that in the beginning. later on foto reference material will be used for detailing as usual.