How to make my skin glow?

I am a total morning person, so when I am getting ready in the mornings and I do my makeup, my skin looks beautiful (I think it may just be the lighting), but as the day progresses, and I take a quick check in the mirror at school or Wal-mart or where ever I happen to be, my skin looks just... bleh. It looks drab and boring, along with my eyes. I'm 15, so I have no wrinkles, and I don't have very bad acne, so I'm wondering if maybe there's some makeup techniques to getting that glow for my white skin, maybe to play-up my green eyes. I also have kind of oily strawberry-tinted skin, so I prefer powder-based foundations. Thank you for any advice you may have to offer me! :D