Makeup tricks to make your nose appear thinner do not involve the same kind of makeup a girl would wear
Its not like you will be sporting the latest mascara and lipstick. the kind of makeup that you will be using will be the kind that blends into your skin invisibly.
You will need 2 shades of mineral foundation (in powder form). One slightly lighter than the rest of your face - IE one that matches your skin where the light falls onto it. And the other should be the shade of your skin where the shadows fall on it, so a shade slightly darker than the face.
This is going to be trial and error...But essentially you will need to extend the natural shadows around your nose so that they come right up the sides of your nose. Do this by applying the darker powder with a wide yet stick, soft brush. I say this because with this kind of brush you have control, as well as the shadow effect.
Don't be scared to wash it off and try again - you are not a makeup artist and if you don't get it right first time, it's no biggie.
Once you think you have achieved the right effect, your final step will be to highlight the top of the nose, this is from between the eyes to the tip of the nose. Just take a different brush, similar though, and gently brush the lighter shade of foundation in small even strokes down the nose.
Use the brush to get the 2 shades to blend and take a picture! You should have created a very nice effect with the foundations