The side art (thread pin,cushion) Would be borders.
The large picture I would cut out leaving 1/4 of white material so hwn you sew it you won't be to mauch on the picture itself. The 2 smaller pictures I would sash them and place on top or bottom of the large picture. Or with the 2 smaller pictures, I would get material to blend with it and sew that material on both side of each picture and place them one on top and one on the bottom or the big picture. Clear as mud right? Hope this helps.