Why hasn't he responded?

I've been with my boyfriend about 2 months. We're both traveling for a few weeks so he asked for a cheeky pic of me in the meantime. I sent him one of me in my underwear (no face showing). I also said I hope I get one from him too, but he hasn't responded yet (been 1 day). Should I text him? What should i say?
Why hasn't he responded?
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