The pastor was very gracious (and I think even a little proud that I would ask) and allowed me to photograph it. Unfortunately, I'm a terrible photographer, the piece is framed and behind glass, and the beautiful sunny day didn't help. The window across the room flooded the piece with light, which made it impossible to photograph.
Since I know I'll be back in that church for an evening meeting sometime later this year, I'll try to remember to bring my camera and try to photograph it at night.