I met a girl on OkCupid a few days ago, and we agreed to meet this Friday. One of her first questions was my height, even though it's written on my profile, and now that we've moved to texts, yesterday she asked for a picture of me. I answered her soon after that I had pictures on my profile, but if she meant a different kind of picture of be open to suggestions.

A day later (today) she sent me a message asking if I'm serious, when I sent a wink smiley with my last message. Now, she might be a prude, or not understand what flirting is (I'm early 30s, she's late 20s), but I'm looking for advice on how to reply to her last message without breaking frame, and while keeping things light and fun.

Any suggestions?