thank you for your answers.
The pattern for 1/1 is given with. But when I look at the other finished FGs, I wonder if the face in 2/2 isn't prettier than 1/1. In fact, I am used to stitch the faces in 1/1 (I have done stargazer like this) but for LL, I am not really fond of the "realism" of the 1/1 faces... :( :\