I've tried the photo routine. The problem with that is this: if you don't immediately have the photo in your hand and ready to show at the moment you talk about it, it will do more harm than good in your interaction. When I have thought of a really good, high value photo to show my target, I get out my phone and search for the picture. However, if she is in a group situation, she's already moving on in the conversation without you. By the time you get the photo, whether it's ten seconds or more, they most likely have moved on to a new subject, and they don't care about it anymore.
Conversations are very sporadic, and they move incredibly quick when it comes to a group. If you can't stay in the conversation and keep up with it, you're screwed. That's why it's best to eliminate anything that requires you to detract your focus from the group for even the slightest second.
Now on a one-on-one interaction, this isn't the case. Although she may become disinterested in the photo, if you take too long to get it, it can still be decent. I don't do it anymore because it never worked out for me either way, but if you were to do it, your best bet would be to store them on your phone and have an immediate shortcut to the photos on the home screen. The less time you take getting to the photo, the better the reaction you will get. In a text conversation, you will always get a good reaction with photos.
So there's my gist of things: avoid photos in the group, be quick with them when with only the target, and feel free to take as long as you like and do whatever when doing it over text.
"There is no better than adversity. Every defeat, every heartbreak, every loss, contains its own seed, its own lesson on how to improve your performance the next time." - Malcolm X