The focus should be on the advisory roles the person fulfills rather than professional or supervisory roles. The nomination should display how the advisor was instrumental in helping the leaders grow, learn, develop a,d mature. When the individual seres on committees and does work for an organization, they are not in the role of an advisor. This type of information is considered secondary to advisory capacities.
Personal examples are often the best way to express the intangible contributions of an advisor.
Talking about some of the problems of conflicts the advisor helped students sort out is also a great approach. Ask yourself why you chose this month above all others to nominate the individual. Please be sure to include the nominator's relationship to the nominee.