How long have you known the candidate? Define your relationship with the candidate and the curcumstances whereby you met.
Comment on the candidate’s career progress to date and his/her career focus
What do you consider to be the candidate’s major strengths? Comment on the factors that distinguish the candidate from other individuals at his/her level
What do you consider to be the candidate’s major weaknesses?
Comment on the candidate’s potential for senior management. Do you see him/her as a future leader?
Describe the candidate as a person. Comment on his/her ability to establish and maintain relationships, sensitivity to others, self-confidence, attitude, etc. Specifically comment on the candidate's behaviour or skills in a group setting/team environment.
I dont have the 100% right answer for you. Talk to your recommender and then try to see how your recommendation letter can work as a complementory to your overall application package.