My situation is pretty different as we dated for ~1 year and didn't have a shadchan. She had been asking me to get professional photos together for a while, so I relented and had her make an appointment. I swung by the studio a few hours before our shoot and dropped off a dozen long-stemmed roses and asked them to incorporate them into the photoshoot, and I told them I'd be proposing.
I got down on one knee halfway through and pulled out the ring. The best part is we have great photos of the whole thing.