I like this layout. Hanging a gallery wall can be a challenge. A great tip to avoid putting so many unnecessary holes in your wall is to cut out the frame sizes using butcher paper. Attach with painters tape and move them around
Here is an example of what a the same framed print can look like with different matting and framing styles. Prices are for the stated sizes of frames with print mounted and sealed with hanging hardware.
picture: Geometrical arrangement: Remember to give to the most important piece a central position, just at the eye level. Then, separate 2 frames with same size by a smaller one. This give to your lay-out rythm and energy.