When filing to an agency, you need to caption the images very carefully. One thing that needs to be insured is that keywords are used in the caption, so that when papers/magazines search for them on either databases or newswires they come up top. It can sometimes be quite a task, as you have to include all the key info such as location, time, date, photographer etc but it needs to read smoothly... Perhaps you could get your student to practice this on some of his shots?
