"Adult" conversation.
Noah wasn't actually about to take a photo of the girl. Firstly, because Macy would likely find it and get upset. Secondly, because - well, he didn't want to. He was not one to find photos ...attractive. He found people attractive. And here was one right in front of him, looking away and biting her lip. What did he need with a photo?
"You could, but you obviously don't want to," replied Noah, raising his eyebrows again, as if to say: eh? amirite?