can i apply this with a beauty blender or would it look better with a brush?

You can do either but I?ve found that the best way to apply this for an absolutely airbrushed finish is with a duo fiber face brush. Tap it onto your skin lightly over your foundation until blended in. If it agrees with your foundation (and doesn?t pick it all up, which I haven?t experienced yet) you can tap on and then lightly buff in for a flawless finish!