In a feature wall there are larger feature pieces that are spaced out. This is one of most common styles used in galleries, where each piece stands on its own with ample space to be admired. Smaller pieces can be used as well, they need to have a strong presence if they are less than 16x20 in this gallery wall style.
Pro Tips: For a feature gallery wall it is ideal to have equal distance between each piece. This creates a uniformity and continuity for the viewer. You can also have uniform height and width of each piece by using frames that are the same size, as long as the pieces you have don’t have huge variations in size.