Pick the surface before the pumpkins
Choose a surface that is easy to wipe and does not need to serve dinner later that evening. Put down a washable tray or another suitable protective layer, then measure its usable area. Three small pumpkins can feel more deliberate than one large one if they leave room around the edge. Check fresh pumpkins for soft spots before bringing them indoors. Avoid balancing them on books or placing them directly on delicate wood finishes.
Let the shapes do most of the work
Group different heights without making a tall stack. Put the largest piece slightly behind the others and turn each pumpkin until its best side faces the room. Add a paper face or a loose ribbon only if it improves the group. Keep stems visible; they give the arrangement enough character without extra props. If children or pets can reach the display, skip loose small decorations and place the whole group somewhere more suitable.
Make the end of the display easy
Keep the extras together in a small envelope so they can be removed in one pass. Check fresh pumpkins regularly and remove any that soften, leak or develop visible spoilage. Treat decorated pumpkins as display pieces; do not assume craft materials are suitable for contact with food. For a display that must last through several events, reusable pumpkins may be more practical. Choose a few shapes you would enjoy seeing again, rather than buying an entire matching set.

