Avenger Superhero Cupcake Toppers by HeavenlySweetConfect on Etsy, $20.00
Picture used to make Iron man pattern. Simplified down to one red piece and one yellow.
Iron Man - Face Stencil by tastic007 - Thingiverse
KopyKake Tutorial by Sweet Sugarbelle. She floods with 20 sec icing, ie, she doesn't pipe, then flood. She doesn't wait for one area to fully dry before moving on. Outline detail piping is done with 1.5 tip.