Google's mini update to Hangouts lets you drag and drop photos directly into the window, instead of browsing through files to select them.
"Wait, hang on a minute while I find that..." is not an ideal thing to have to say in a quick, 15 minute business meeting. And you might not have to again, as long as you're prepared.
If you're like me, when you're in a Hangouts meeting with multiple people, you may want to treat the meeting space like a front page, and curate it appropriately. That means paying attention to publishing, and it can be helpful to have a side window with large thumbnails ready to drop in at the appropriate time.
It'll give you a chance to confirm so you don't have to worry about mistakes. The ol' copypasta should also work.