Retouching about 15 photos,most of them are whole body mostly skin retouching

I am interested in retouching about 15 photos, not closeups, most of them are whole body, some of them need min of retouching, Mostly skin retouching is needed. In order to start exchange files I need a conficenciality document to be signed because I wouldn't like the pics to be exposed publicly. I would appreciate it If you could give a price range per picture as well as a price range for the whole project.
Respectfully,
Maria Christoulia