When posing under trees, be sure to watch for shadows on the faces of your subjects. It is very important to watch for shadows. Various times of day require different posing techniques. If you see a shadow when you are looking at the subjects, the shadow will be prevelent in your photograph. The opportunities for photography are endless.
Creativity is a key source.
The more creative you are, the more likely the customer will be pleased and refer you to their friends and family. Patience is a must. People tend to have portraits taken of their children more often than anything else. If you feel uptight and uncomfortable when working with children they will pick up on this and in return feel the same. Have fun and let your imagination take over.