How do you ask a guy for a picture of himself without being annoying, or too upfront about it?

I like this guy a lot, we've been talking on kik for a while now, and he hasn't updated his profile picture on there for a while, and I want to ask him of an updated picture of himself without being annoying or too upfront about... I don't want to scare him off, but I know he likes me cause he told me he did
How do you ask a guy for a picture of himself without being annoying, or too upfront about it?
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