It is best to avoid photoshoots through the middle of the day as the sun is directly above and tends to cast shadows. The best time for great lighting is in the morning between 8:00-10:00 and in the evening 1-2 hours before sunset.
Try to avoid wearing white and busy patterns! Photos look best when subjects are wearing bright colors that pop!
It is best not to be matchy matchy. Family portraits look great when everyone is coordinating with a specific color but not matching completely.
It is always fun to bring a few wardrobe change options and extra props!