Get your items ready and packed up. Unlike the big fashion scene you may need to provide items of wardrobe and props for a shoot. This should all be discussed and worked out before the shoot. If you have talked about bringing certain items please be sure they are packed and ready to go the night before. This avoids last minute running around and forgetting.
Reliability again is part of being a professional.
You may need to put on a base make-up before leaving for a shoot. By taking care of your contouring and base items before the shoot it helps speed matters along. This is not meant to cheat you out of billing time at the studio, I would expect to pay more per hour for someone who can do their own make-up and who comes prepared. You may need to have no make-up on at all before you arrive for a shoot. This is why a photographer appreciates a model he can communicate with so that all these things can be worked out ahead of time.