DO'S:
Im my opinion "simple is better"..
Make sure you are comfortable in what you have on (does it fit)
Add accessories for contrast (scarfs, hats, jewelry..etc.)
Pick a color pallette for the whole family that works for everyone
Ask me if you have any questionable ideas
Bring more than one top if possible
Put a fresh coat of nail polish on fingers and toes, or remove it all
DONT'S:
DONT wear all white
Stay away from "busy" patterns. Color is good but patterns sometimes take away the attention from the subject(s).
DON'T run out and buy things and just bring it without trying it on first
DON'T wear your old sneakers
DON'T wear chipped nail polish, it will show up in the photos