Here's how I decide on an arrangement:
I lay all the frames on the floor and arrange them.
Then take a picture, because it helps to look at the arrangement as a picture, for some reason. Then, tweak away. Here is my first try:
Hmmm. It's ok, but I didn't like the three small frames at the bottom. Just didn't look right. Arrangement number 2:
No, this wasn't right either. I didn't like how it looks like one row of pictures down the middle. Just not right. I also realized that I wanted to go wider instead of longer to fill the space I had better, and to keep the pictures up higher away from little hands. Try again, number 3:
So I went wider this time, but this didn't look good at all. Try again, number 4:
I liked this one better, but I had a couple of frames that were bugging me. I realized it was the actual frames I didn't like. (the smallest ones) I wanted to take them out, but also wanted to have several empty frames in there. There was also the empty space on the bottom left to deal with. Try number 5:
I like it! I took some other frames that I had pictures in but weren't using in this house to replace the small ones I didn't like. I planned to paint them black and they would be perfect! Here it is on the wall:
There are five empty frames, so to hold the place for future pictures I am going to put a picture of all the girls, a picture of all the boys, a picture of all the kids, a wedding picture, and one more I can't decide. Any suggestions?
THAT is how I decide on big arrangements. :)