Rainbow Pumpkin Step by Step! 🎃 1: Draw a pumpkin shape in black Brush Pen, complete with a curved outline, triangle eyes, a triangle nose and zigzag mouth. 2: Fill in the outline with an orange Brush Pen. Add some black curved lines on the forehead and cheeks to give the pumpkin its 3D shape. 3: Make a rainbow on the chin. Take Brush Pens in black, orange and white and paint vertical stripes, starting with black, then orange, then white. Add white dots across the surface of the pumpkin.