A blush brush is surprisingly similar to a powdered brush. Brushes for blush are generally a little stubbier, however, as they are covering a smaller area than a powder brush. When applying blush, try to avoid Raggedy-Ann-reminiscent red circles on your cheeks.
To avoid the doll look, diffuse blush outward while applying to the apples of your cheeks. Start with light pressure and test out the pigmentation on your wrist or the back of your hand. It’s much easier to build color than it is to wipe it away after it’s already been applied.