This is what I am Packing for my beach photo shoot, I like to pack only one bag and keep it simple and to the point:
Two bathing suits
Sandals and heels
Scarves, hat, sunglassses
Makeup: Bronzer, mascara, light and peachy and gloss
Nail polish- for any touch ups.
Hair clips, and a brush
Shaver- for touch ups
tooth brush and toothpaste, for fresh smile at the shoot
I might bring some airbrush makeup spray to touch up before the shoot, but if it is hot airbrush and creams and lotions and oils can drip and make a mess, so it is better to not use them on a really warm day.