Makeup
Apply the base over your entire face and down your neck to get that unhealthy pallor.
Get directly under a light source and start using eyeshadow to accent sunken areas of your face. Find shadows and darken those a lot.
Black out your eyes completely, but keep it under control. Make it look like your eye sockets have shrunken in about an inch. Get darker towards the middle and inside corners of the eyes, making sure to accent natural shadows. (you can even try a darker gray shade; this sometimes works better for a realistic effect than black)
If you’ve got dark hair, lighten it up with baby powder.
Blood
1 cup of corn syrup or pancake syrup.
1-2 tbsp of red food coloring (Not a cheap brand either; they don’t give the right “red”).
Some chocolate syrup, like the kind you put on ice cream (not a “shell” type).
A couple small drops of blue or green food coloring, for color preference.
Mix well and add small amounts of water until desired consistency/smearing factor is achieved.
Additional tips
While applying fake blood, make sure you’re messy, and get it on your clothes. This stuff runs and seeps in quite well and looks extremely convincing.
Use a knife or other pointed implement (carefully!) and rip holes into your costume. Go outside and roll in the dirt. Just get your clothes all messed up.
Make moaning and gasping sounds when you breathe through your mouth. It adds great effect. Your jaw should hang slack at most times. If you must make other noises, talk in gibberish or moan louder/higher. Moaning always works.
Shamble, don’t walk. Lean forward and almost fall with every step. Adding a limp or dragging one leg works great as well. Swing your arms limply, like you don’t ever use them.
When passing people, growl or groan at them and wave your arms. Some higher-level zombies tend to moan for “BRAINS!!!” as well.
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