Gallery wall
A gallery wall works when the parts talk to each other. These series are drawn for one another — same palette, same line, same light — so you are not guessing whether three unrelated prints will sit together on the wall.
Three or five, not four. Odd numbers read more naturally, and three prints in the same size is the easiest gallery wall there is: one spacing all the way, one line to align to.
Leave 5-8 cm (2-3 in) between frames. Tighter and they merge; wider and the group falls apart. See the full gallery wall guide.