When to wear cream:
If your skin is dry, going with a cream blush formula is the way to go. "I would suggest using your first three fingers for a cream blush and just tapping it into the skin lightly," McCarthy advises. "Start with a little. You can always build and add, but you can't take away."
When to wear powder:
If your skin is oily, go with a powder blush formula. And in terms of how to apply it, a good old-fashioned blush brush is the way to go.
And when to do both:
"If you want it to really have staying power, I suggest wearing a cream and a powder," McCarthy says. "That's a really great tip for brides." But to avoid caking or blotching, just be sure to layer in this order: cream (or stain) first and powder second.