We plan to create a photo collage & were wondering where would be the correct place to show our pictures. Suggestions needed!

I don't think there's an incorrect place. In the US, for reasons unknown, many homes have family photos on the wall going up the stairs. Others in an office or den. Some on a fireplace mantel, or a grand piano. Most seem to be in a cluster, and I think that's a good idea. Some guests don't mind looking at them, but many don't, unless related to you.

Real estate agents warn home sellers to take down family photos because buyers want to envision the place as their own to decorate. If that means anything for your future.

I personally wouldn't care! It's my home and I'll do whatever I want. Almost all of mine are in my kitchen. One in the dining room on top of a tall cabinet.
There's enough rules in life, and I want to rebel when I can.

It's your idea, so be creative and try different spaces for your photos until YOU are satisfied. Or as my wife says, move them about as the feeling hits you.