The first one man show I had was a bunch of 8x10's done at college and the whole event is a blur. The second was all 11x14's and what I found was that people stayed at a comfortable veiwing distance; which meant they kept about 4 feet away from the prints.
No kidding...it was like they were on a conveyor belt sliding parallel to the galleries walls. This bothered me on several fronts; it meant they weren't really engaged, and that inimate close-ups were the same size as distant big sky landscapes...something that just looked wrong to me.
The last show was a range of 5x7 close-ups, 8x10 middle distance scenes, and 11x14 distant big sky landscapes. I liked this better because people would move in close to inspect the details of a 5x7 close-up, move to the 11x14 beside it and stay in close to appreciate the subtle details, then stand back to take the whole print in. Instead of bodies shuffling sideways like they were in a trance, they became engaged, constantly moving in and out.
The next one will be from 5x7 up to 16x20 to better accomodate the range of camera/subject distances between close-ups and big sky landscapes.