Chirality: A Look at Emotional Asymmetry of The Face
Causes of Facial Asymmetry
Masuoka et al 29 assessed the relationship between facial analysis and cephalometric indices by means of photographs in frontal view and posterior-anterior cephalograms of asymmetrical patients.
Lop-sided facial features may unconsciously provide a signal that a Asymmetrical facial features is less desirable as a mate due to the stress they experienced in early life which could leave them vulnerable to disease and premature death.
Facial symmetry - Wikipedia
Facial asymmetry: a current review
They examined 15 different landmarks on the face, including the positions of the eyes, Asymmetrical facial features, mouth and ears. Moreover, an accompanying tilted chin was often noticed in those patients.
Photographic Psychology: Facial Asymmetry and Character
Photos: What Symmetrical Faces Really Look Like
How your childhood is written in your face - Telegraph