Never ever shoot in a studio on auto! You need to have the shutter fixed ideally on 1/125 or 1/60 which are the lowest you can have without motion blur, then shove it on a tripod for good measures. If you have enough modelling lights then you can use a high aperture as well, and still have it on iso 100. your white balance needs to be corrected for the background as the images look too yellow, and you should use a white sheet not a pink one, as the light will reflect off the background and back onto the subject.