How To Use Brush hairs upwards to reveal brow shape. Use micro precision pencil to fill in brows and brush through. Product Details The world needed a micro-precision pencil which mimics natural brow hairs to elongate the brow structure. Charlotte Tilbury wanted to make it as fool-proof as possible so that you could have precision application glide without dragging and colour with no ashy undertones to create the illusion of fuller looking brows. Infused with vitamin E to condition Brow Cheat features a high concentration of pigments to create natural-looking colour with depth. The formula is rich in emollients allowing for smooth application enabling easy creation of definition and shape.