In order to get a smooth, glowing, sun kissed look you got to use a few different blushes. I normally use about 3 different colors, a highlight, contour and blush with color. I start with the contour, a soft brown that will give your cheeks some definition, next blush on the apples of your cheek normally a peachy color, and finally a highlight on the high point of your cheek bones. Its makes a huge difference. Try it and let me know how it turns out.
Contour: soft brown to give cheeks definition (bone beige MAC)
Apples of cheek: a peachy color (Melba or MArgin MAC) with or without shimmer (this depends on your skin tone)
Highlight: I like to use Vanilla Pigment from MAC