Take a look at the Iconic Double Ended Sculpting Brush.
One side is fluffy - perfect for blending your bronzer seamlessly into your cheekbones but yet its thin enough to ensure less room for error (i.e. that not half your face is contoured only your cheekbones, this is essential)
The opposite brush head is a tapered one which makes the precise placement of your highlight so easy. You don’t want your highlight going all over the place so this brush head is great for that
Looks fab in your makeup bag beside your Sculpted Beauty Block see picture above beside the brush (link to those if ya need one just below)