Hey YarridHenrard, I'm fairly new to this but all I've done is face and body since I started. Some things I have learned that might be of use to you:
1. Shoot RAW as high-res as your camera will go. Photoscan doesn't support RAW (except I think now .dng is supported) so convert all your images to TIFF in Photoshop, 16-bit and import those files into Photoscan. I will often also remove chromatic aberration in Photoshop but not much else. Whatever you do, DON'T do any image manipulations like stretching or scaling or cloning.
2. If the model moves an inch, it's all over. At least, you won't get a perfect scan.
3. Set your ISO as low as you can and your aperture to f11 or better (meaning higher, f16, f22, etc.). You might need a lot of light for this and that's the downside. So I'd suggest taking your model outside, on a cloudy day where you can set your camera accordingly. In a studio with those settings is going to require a LOT of light.
Why these settings: low ISO eliminates/reduces noise. High aperture setting increases how much of the shot is in-focus from front to back. If you're already a photographer and you know this, sorry. Not trying to talk down to anyone.
4. Shadows will mess up the scan. Hard shadows, that is. You don't want any shadows if you can help it.
5. Fill your frame. That is, get right up close to your model. Don't have her face filling 10% of the picture. Fill the whole frame.
6. Make sure every shot is in-focus. This is where aperture comes in. If you're shooting at f2.8 (for example) and you're 12 inches from the model, she's not going to be in focus from front to back. But either way, your shots have to be in focus. So rather than racing around with your camera in machine-gun mode, take the time to focus and shoot, focus and shoot. Sure, the model has to stay still for longer. But that's not too hard if they're supported by something.
7. Having said that, shoot as quick as you can. NO ONE can hold still forever.
8. If you can, to reduce time, get some friends with cameras to shoot at the same time with the same rules as above. That would cut your shooting time down considerably. Doesn't really matter if they're all using different cameras.
That's my input. I finally managed to shoot a ballerina's head with the above things in mind. Man, she came out PERFECT! And we shot her with 3 different cameras, 3 different lenses under fairly controlled conditions (she had something to lean on...).
Good luck!
Jon