Here are some suggestions for the pink eyeshadow if you want something simple
Use Milani Wet-To-Dry shadow (apply wet) for a dramatic hot pink look. Get one in hot pink, and then a darker hot pink. Hot pink on lids, darker hot pink on side of lids.
You could put the balloons on your face with acrylic paint (I did this for my Pikachu cheeks) but I think it'd be better to just accent those on the costume itself