Glossing seems easy; but do you know how to do it?
The ideal is to first redraw the entire surface of the lips with a very discreet pencil , that is to say close to their natural color, in order to unify the appearance and to hem them with precision. After which, with the tip of your finger, you will apply the gloss in the right measure, by small touches , without stretching it so as not to erase the color of the pencil.
A lip trick with a brush , again in small strokes without stretching , and you're good to go!