2. Volume with a help of lip color
Image Source: vk.com
You can try the following trick. Take a white concealer or foundation and apply it to the lips, finishing with light powder. Then draw a contour (going a bit over it) with pink or red pencil, fill in with the same color also the middle part of the lips.
Another option – is to leave the inner surface lighter than the contours as on the photo-lesson №2.
Apply lipstick with a brush to the lighter parts, this will highlight the lips and give them more volume.