How do I get him to do this?

So I like taking pictures and seeing pictures of myself. They remind me of memories and it's always fun to go through old photo albums. I want more pictures of my boyfriend and I together we do a lot with each other but i dont have pictures to remind me of those moments. I'm not sure how to get him to smile and not cover his face infront of a camera. Any advice?
How do I get him to do this?
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