These photo enlargements were on display at the Alaska Museum, which I visited in June. What was really interesting about them was that they had been cut at a slight angle instead of perpendicular to the face.
The photo enlargements, especially those on thinner board, barely showed the sides of the board. This gave emphasis to the photo enlargement, and reduced emphasis to the edge. I liked that! After all, the photo is what you are talking about.
We are really used to doing perpendicular cuts on our photo enlargements, so you’ll need to be sure to specify that you would like your museum graphics trimmed this way. But, we can do it if you like!