I piped small circles of macaron batter for the eyeballs once the macaron rounds have set. It gives it a nice raised texture once they are baked. I painted the outer edges with edible Pearl Dust mixed with a little lemon extract and filled them in with white chocolate. I then dotted each eyeball with milk chocolate. I drew the rest of the details with edible marker :)
The birthday girl loved her minion macarons so I was very happy!