If you – like me – are yet to perfect super skinny, ultra-perfect eyeliner, meet the new class of rollerball applicators. Available in Black Moon, Golden Rosé or Bronze Patina (left), Nudestix Rock N’ Roller Easy Eyeliner Ink (£20, cultbeauty.com) promises glide-on, even lines, while Guerlain La Petite Robe Noire Roll’Ink Liner (right, £24, houseoffraser.co.uk) wheels on straight and is waterproof. Take the Carolina Herrera SS18 show as your cue – then rock and roll.