Cut a piece of clear contact paper that measures the same size as the canvas. Draw a pumpkin shape on the contact paper.
Cut out the pumpkin shape using scissors or a craft knife.
Carefully remove the backing and lay the paper sticky side down onto the canvas. Make sure to press down along the entire surface of the contact paper to make sure it's fully adhered, and centered on the canvas.
Squeeze some of each colour paint onto a paper plate or plastic paint palette. Dip a finger into the first colour and make dots all around the exposed canvas.
Continue to layer the second and third colored fingerprints, wiping your finger off between each shade.
Once all of the fingerprints are layered, carefully remove the contact paper while the paint is still wet.
Once removed, the paper will reveal a perfectly painted pumpkin shape.