Line the up by the top of the frame in two rows. Something like this.

You might want to paint a matte black rectangle to unify the group.

First, paint corner trim same color as wall. Then hang photos like this. Best if all we relatively same size. But this will work until you can get the smaller ones reframed with slightly larger mats to get sizing right.

These are too small to be grouped on a wall. Get larger frames and mats, then group as suggested.

You can also take the photos to a framing shop, and have them matted as a group in a single frame.

I would do the single frame idea they are way too small to be hung in a group

Agree with @Valinta If these are digital photos, blow up the images to a larger size, then mat and frame them. I'd do a mixture of larger and smaller sizes. If they're not digital, then you can change the mat sizes to vary the size of the frames.

Not a Pro.

Beautiful photo's!

The size of the framed photos are quite small. Find the smallest wall in the room and fill that space with them.

Not a Pro.

If you want to keep them on that wall, an other option would be to add a shelf underneath them after you have figured out how you want them arranged. That will add weight to them for the size of the wall.

Edited:

One more thing, add your window treatments before hanging your framed photos. This may make your wall space smaller.

Change out the frames for various sizes just use a matting to fill out the space. Don’t go too big though.

Oops already suggested. Lol. Paint the frames different colors to add interest.

They are too small
You need a larger frames

Also, make sure the frames are not the same size and even the color
They don’t have to be the same

I would arrange them so that they are in an imaginary rectangle. Looks to me like you have 2 frame sizes. Put the 3 larger ones across the bottom as I have shown. Leave about a frame's width between the larger frames, then fit in the 2 smaller frames in the right corner. I like that they are all the same colour.