The posted photos are so random. And that low one on the right is just weird.

Place the largest one where you want it (a few inches lower from where it is now would work), then align the top of the one next to it with the top of that frame, then build from there. Keep the edges aligned and give them space to breathe.

Start by taking them off the wall and laying them on the floor and playing with the arrangements. It will be difficult because the smaller frames are close to having the same height dimension but clearly don't. Can you add anything else? How about a group of the 3 small ones and the large one deliberately spaced away from them?

Experiment on the floor.

Thank you so much for the advice! I was playing with them on the floor but couldn't come up with anything that I liked... I just uploaded a third pic with the clock, maybe that would be usable.

How about something like this? And placing the little painting somewhere else in the apartment.

It is hard to put all that behind the love seat, but I also love to group my art. Here are some layouts. Try to keep the edges of the frames in line to make it go together better.

Wow! Thank you houssaon, #1 and #3 are really nice!!

I came up with two more options in the meantime, but I like yours better!

This is a lousy selection of frames to arrange. There is not enough variation in sizes and aspect ratios to get proper balance and movement. If you had a large portrait format piece...

Groveraxle has shown you the best way but, to be honest and not mean, I feel you need some colorful and more interesting art work. I like the last configuration.

If you require a clock, select a table top model.

Add an end table for the junction of the sofa and loveseat and add a table lamp for reading

Move the live plant closer to the window

Why are your walls so blue?

I know you only asked about arranging the current frames, but since Beverly decided to critique the room, I guess I will too. It's unrelievedly brown and orange. I'd really advise doing something like this:

I really like this. I will look for a bit more lively art. THANK YOU!

Walls don't look blue at all to me.

The first square is the paint color with a portion of the drapes next to it.

Do you still not see the bluish undertone on the walls?

The walls definitely look blue to me. Just wonder if it's the lighting...? I do like Beverly's second square for paint color.