Wash watermelon under cool running water and pat dry.
On cutting board, place watermelon on its side and use kitchen knife to cut off 1/4-1/2-inch of rind from bottom to provide sturdy base, being careful not to cut too deep into white part of rind. Cut 1-2 inches from stem end to create opening for bowl to be added.
Using dry-erase marker, draw eyes, nose and mouth, along with wavy slits around carving. Use paring knife to cut them out, being sure to cut through to red flesh to let more light flow through.
Use melon baller to hollow out inside of watermelon. Reserve watermelon balls. Use scoop to remove remaining watermelon.
Using vegetable peeler, remove green skin off outside of watermelon, similar to peeling cucumber.
Wrap thin strips cheesecloth or gauze around mummy carving and secure with straight pin, if needed.
Place battery-operated candle or light inside carving and fit small bowl into top of carving. Trim away excess rind to make bowl fit securely.
Fill bowl with melon balls. Attach candy eyes or blueberries using a toothpicks, pins or glue.