My photographic joiner

I was going to add this to my exhibition wall, but I had a downfall. As I was cutting the foam board I had mounted it onto, the Stanley knife was not sharp enough, this ended up with the edges becoming extremely ragged and worn down, this did not look professional when it was on the wall, the tutors told me they the exhibition looked perfect as it was. At first I felt disappointed as I had worked well to create it but had let it down by the edges of the foam board.