1. Draw the sketch. Try to draw the lips the most realistic possible..

2. Use natural colours and dyes and paint almost the whole mouth.

3. continiue in the others points with soft colours

4.Make more intense the line in the centre of the mouth, between the lips.

5 .continiue in the same points with more intense brushes

6. Make darker the line in the centre and add some other details.

7. go in the “colour” and give a red soft tone in the mouth

8. Continue with definition using more intense colours.

9. Give certain white details and make more red some other points

I hope they is helpful!