It is important to choose the correct foundation color for your light brown skin. Choosing a color that is too light or too dark can cause the skin to look placid or muddy. There are many different types of light brown skin because people have different undertones. Some women have pink undertones while others have blue undertones, which is why there are so many foundation shades to choose from. Visit a cosmetic counter where you can get color matched to your skin tone. When wearing the correct foundation, it should appear as though no foundation is on the face. Apply the foundation with a foundation brush or use a "beauty blender," which, according to Beauty Blender, "has been created to leave you with a professional finish and a flawless complexion."