How do I push back the jawline?

[Fixadent]

Which option to I select in looksmenu to push back the jawline of my character?

 

[PlayerKiller]

Depends on how you want to define your jawline. Face-lower, Jaw Middle, Jaw Outer and to a small extent Cheek, Jowls and Neck effect the Jaw lines appearance and how harsh light hits the mesh which gives that bad contour. But to answer your question you will be dealing mostly with the Jaw Outer Morphs .

From the looks of It seems to me like you have it set scaled somewhere towards the extreme small end, you moused upwards pretty high, inwards pretty deep and scrolled back quite a bit but not all the way, I find going towards anywhere in the extremes makes for a weird appearance but that's just me and my preference.