If you don't apply foundation before going out, you're making a mistake. Foundation, if applied well, can make your skin look soft, smooth, flawless and simply spectacular.
Make sure the foundation matches your skin tone.
Do you have a sponge for applying foundation? If not, get one. It ensures an even application.
Mix a little moisturiser in your foundation. Most skins are dehydrated even though we may not realise it. In any case, moisturiser adds a sheen to the foundation.
Mix an equal amount of foundation and moisturiser in the palm of your hand, and wipe it over your face.
Blend it with a damp sponge and finish off with a dusting of compact powder. And voila! You won't be able to tear your eyes away from the mirror.