First off, make sure the makeup you are using does not say "matte" in the description. This will give a very even skin tone, but it can make it look flat sometimes.
Also, make sure your true foundation - your skin - is in the nest health possible. St. Ives makes a wonderful facial scrub (Apricto Scrub - Invigorating)that I use every other day, it's pretty mild, but it does get rid of the dead skin. ALso it smells wonderful! They have several different formulations if you find this one a little too harsh for you.
Drink plenty of water.
Check and make sure the foundation you are using is not too light for our skin tone. If so, it can give you that "goth" look without even trying. It might not seem that obvious, but just enough to make you look pale and drawn.
Then look for foundations that say "illuminating" or "lights" in the name. One I use is Revlon's Skinlights face illuminator. It's a little shiny, so I pretty much relegate it to when I'm going out to parties, or a special night out. But if your skin is very dull - it might not be too much on you.
And finally - the entire goal of foundation is to look like you're not wearing any!