you can try contoring which is where you use diffrent shadowing makeup to change the shape or your cheek bones, nose, ect. Personally i think peope should just leave there face alone cause its ment to make you look like you. But if you really want to theres a ton of videos explaing how to do the contoring.
Apply a little bronzer to the sides of your nose ... proper shading can make it look thinner.
Nothing, just plastic surgery.