It's all up to you...if you are uncomfortable with it then you need to tell him. Whether or not he has a 'problem' can't really be diagnosed by anyone but himself and/or a professional who has assessed him. If it bothers you ask him not to do it. If he continues, well, then there's a problem. And as long as you let him know that you're thoroughly creeped out by it and you do not consider it fun or funny or harmless, even when they're pictures of you, then it's all above-board. Everyone is different. Some people care and some don't. It's really hard to compare your experiences to someone else's; just try to go by what you feel.