A picture gallery...

My oldest daughter is an artist who uses unusual medium to create her paintings.  So it came as no surprise that she wanted to do a picture gallery on her dining room wall that was asymmetrical but balanced.  We saw the idea on Pinterest to have a horizontal line across the arrangement that all the pictures would go above or below.  So we used painter's tape for that horizontal line. 

The next thing we did was lay all the pictures and initials out on the living room floor in an arrangement that she liked, then transferred them to the wall one at a time.  The thing that saved the most time was putting toothpaste on the hooks on the back of the picture frames and pressing them to the wall to mark where the nails would go.  We probably saved several hours because we didn't have to measure anything.  Also, we used a small level on the larger frames to make sure the toothpaste marks would be level.