This is how I went about doing my skeleton makeup for myself and my boyfriend as well. Same steps apply for the guys version, just a different neck.
He bought coloured contacts which really added to his look, They are about 50$ depending on where you go.

Step 1: Steps

Each step of how I did my make up
Outlines (in regular eye liner) , White halloween make up (from value village around halloween time) - applied with a make up sponge, then black halloween make up (also from value village) I went back and touched up the black jaw and teeth lines with a liquid eye liner and added the cracks with liquid eye liner, (if you don't do it in this order the white will get all muddy if theres already a lot of black paint)