Peel the clementines and separate any loose pith. The orange peel stays on; you are drawing on the peel, not the fruit. Wait, re-read the concept: the peel stays on the clementine. The face is drawn on the unpeeled skin.

Use the fine-tip black food-safe marker to draw triangle eyes and a jagged or grinning mouth on each clementine.

Use the broad marker to fill in any areas that need heavier black lines.

With the paring knife, score a small shallow slit in the top of each clementine where the stem indent sits.

Push one piece of celery stick firmly into the slit so it stands upright as the pumpkin stem.

Arrange in a low bowl or directly on the table, clustered together for the pumpkin-patch effect.