Getting the facial hair just right on your Halloween costume is tricky, but it can be done with a mascara wand and some tinted brow gel. Use the clean spoolie to apply a long-wear gel eyebrow product like the L'Oreal Paris Unbelievabrow 30h Longwear Brow Sealer (£11) in a stippling motion. Use two separate colours to make it look more like a five o'clock shadow.