Bright colors are always a great idea. Bring several outfits, accessories, and shoes. It is better to bring more than you need than to get here and not have what you want. Girls should bring their make-up have hair products for touch ups.
Coordinate colors for groups.... not necessarily the exact same color. Consider the style and feel you are looking for in the photo.
Bring any props you want to use.... musical instrument, athletic jerseys or equipment, favorite toys
Pets are welcome at all sessions (no exotic animals)
Last, but not least bring your SMILE and LAUGHTER!!!!