I personally wouldn't exfoliate on the job. Just ask your model to do it at home before the shoot. When done the day off you risk skin irritation, no shower and not removing it completely. Also make sure your model is waxed of all body hair it just cleaner and less work for the retoucher when the hair is all gone, including baby hairs.

After the body is covered and evened out add shimmer highlights with a brush don;t use your hands the warmth of your hands will reactivate whatever body makeup you put on and it'll smear and be uneven. OR use a sponge like the beauty blender, genius for this. and stipple on the highlights.

for a sheen use a dry oil spray. much easier to apply when you spray it on.