This is just one suggestion of many for placement. Note the spacing between the sofa and lowest frames, as well as the spacing between frames. What you show in your photos looks too high. The frames need to have more of a ”connection” with the sofa.

You can also look online for ”gallery wall tips over sofa” to see what might appeal.

The idea is to get your assembly to read as once object.

Where is the full picture of the SOFA IN THE KITCHEN?: )

What does the backsplash have to do with your question?

What size are these? What size the couch?Add more useful context for better advice.

IMO too many little frames in one space . I do love "gallery " walls usually but I do like all one size frame and hung in a row down a hallway in some cases . IMO anice large piece of art above the sofa . But i need t see the whole room to really understand this idea . I see that one skinny wall with a mix of stuff that is IMO the only wall with mixed stuff in a space and I like that one but those pieces could be hung a bit lower .I think you have beautiful scenery out that window no need for a bunch of wall clutter

Gallery walls have more impact if they are placed where people can actually see them - if that is your intent. If you are looking for space to display this large number, move them in groups (similar locations or venues) in different rooms, hallways, even a bathroom, and find a larger art piece representing your style or passion for the sofa wall. You could even move your gallery pieces from room to room for variety and exposure.

OK?

How about using ledges for your vacation pics? Pictured is our vacation photo spot on wall of staircase landing. Advantage is you can change out sizes and arrangements easily with no worries about existing nail holes.