The right foundation can transform your appearabce and make your skin look natually flawless. However women tend to think that fondation is used to cover up flaws so they tend to put on too much and therefore make their skin look cakey and mask like. The basic purpose of foundation is to even out your skin tone. The more even it is, the fresher your appearance will be. Less Is more!
The 4 pillars of the perfect foundation are:
Shade-The right shade should blend in to your skin so well that it looks natural.
Form- Liquid, cream to powder, loose mineral powder..whatever you choice may just depend on the texture you feel most comfortable with.
coverage- It is much more youthful to have a little skin showing and only wear as much as you need. If you complexion is fairly even then try for some lighter coverage, If it is not even then go for full coverage.
Finish- Natual , matte, dewy , velvety, luminous, etc… the finish that is right for you is what is going to be the most flattering to your skin.