They look too small for that wall. In another smaller space you could hang the flower art above the red arrow art and hang the black figure to the left of the other two.

Definitely too small for that wall alone....would have to incorporate something else.

Agreed with @Kim, the wall needs larger or more art. I would look for a smaller area. Hang large art and to the right or the left, hang horizontal or vertical stacked above one another. All spacing at 1-1/2". You can either flush bottom of art or top of art to large piece or just center the 2 stacked centered on the large art. (one side closest to large art could also be flush to edge of large piece.) Look at them laid out on the floor and see what feels good to you. Hang art at eye level usually around 57" from floor.

Agree that body to the left and stack other two. But need at least two more pieces of smaller art.