1. What is the difference between a Formal, informal, environmental portrait?
Formal is posed and stiff.
Informal is relaxed and not obviously posed.
Environmental is the person in their natural habitat, where they normal are on a daily basis.

2. What do the eyes tell us?
The eyes tell if they are thinking deeply or if they are in a position where the are just looking simply at the camera lens.

3. What does the background and body position tell us?
The background tells where they are and the body position tells if they are relaxed or kind of uptight.

4. How does the lighting affect the shot?
The lighting can show off the face or hide the face.