Today while running errands, I ran across a female, with a not so good choice of Foundation. I know that many women still don't know the proper way to test foundation, but at some point you have to see the difference. Do you still wear it anyway? There is always the reliable jaw test, taking three foundations closest to your skin tone, put all three on your jawline and whichever one fades into the skin is your correct shade.
What you don't want is to end up to light looking like a ghost or two dark. Foundation is to enhance your beauty, and even out your skin tone, not change your overall appearance.