Next roll out the red fondant to 1/4-inch thickness. Cut out the oval shapes white a sharp knife and store any extra fondant in a ziptop plastic bag so it won't try out.
With a black edible ink marker*, draw the spider web design on the red ovals. Make sure to press very lightly with the marker because it is easy to dent the fondant. Set the red ovals aside and let the ink dry.
Roll out the white fondant and cut out the eyes. To attach the eyes to the Spiderman mask, lightly coat the backs of the eyes with water. Then, place the eyes on the mask. Let the toppers dry completely before placing them on the cupcakes.
*Edible ink markers can be found at most craft stores