How do you ask a guy for a picture of himself without being annoying, or too upfront about it?
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You might end up surprised at the direction your conversation may take.
Repeat after them once or twice, not more.
How can you ask someone if they like you without being obvious? Lastly, keep your selfies and other pictures to yourself unless it has been okayed by them.
Your colleagues approach to this was just fine and can be copied for situations in the workplace.