How can I get him to take a picture with me?

[Adam1978]

That sounds like something a girl would do to post on social media or show girlfriends. I say get the relationship started before asking for a thing like that. Guy needs to worried about stuff like that these days. You don't want to deal with false claims.

[AdithyaR]

Depends how he responded. If he's into you then it's fine to ask.
If he's not, it probably depends on whether he feels awkward around you or not.
Best to just ask him and sort it out.

[Anonymous]

Do you guys hang out a lot? If so take that apportunity to ask him

[Wise4myage]

Ask him in a nice way, I'm sure he won't mind.

[Montano_lady]

Just bring it up casually

[Lostguuy]

Sneak up on him when he’s asleep