Hi Maneca! That's such a good question! One of my friends on the network, XOXander, is a makeup artist at Sephora. Let's see if we can invite him to the forum and see what he says.
As for me, I go with brighter tones during the summer. It's hot, my skin is many shades darker, and I love wearing bright colors when I have a good excuse! One being, school's out!