Be specific about what you appreciate
Compliment his effort, not just his appearance
Acknowledge his skills and abilities
Notice his character and values
Praise his confidence when it is genuine
Tell him when he makes you feel safe or supported
Appreciate his sense of humor
Recognize his style or grooming
Compliment his intelligence or insight
Thank him for thoughtful actions
Be sincere and direct
Keep it natural and timely
Match the compliment to what he actually did or said
Use his name when giving the compliment
Let him know his presence matters to you