Chances are that you are not moisturized enough. Choose a moisturizer that fits the need of your skin. Is your skin dry? Use a heavier face lotion. Oily? use a oil control face moisturizer. If its normal...well you can use just about anything. Another reason why your face/foundation may look dry is putting on way too much powder. Did you know you only need 1-2 light swirls of powder? and that you don't need to place powder everywhere? We normally concentrate more of the powder on our t-zone, and then spread it lightly everywhere else.
These are just tips, and are to be used with caution. ~Hawaii Makeup Artist Face Art Beauty