This foundation is highly pigmented and gives excellent coverage, so you really don't need much at all. However it is pricey for only a small amount of product so I have now opted to use a different brand.
I started out with shade light which was much too yellow toned for me, I recently tried shade fair which is much better. It provides a nice light layer of coverage, and is ok for me to use every day even though I have sensitive skin. It's easy to apply quickly when I'm in a rush to get to work and just want something on my skin.