Syntax

Syntactic actants

Actant 1: whose cheekbone it is
(a) Genitive
(b) Possessive
Скулы Николая сильно выступали над ввалившимися щеками. Nikolai's cheekbones jutted sharply out over his haggard cheeks.
Её правая скула была разбита до крови. Her right cheekbone was bruised and bloody.
NB When the word скула functions as a subject and does not have a descriptive modifier, the construction скула у + Genitive is often preferred to (a) and (b), above:
Скулы у Николая сильно выступали над ввалившимися щеками. Nikolai's cheekbones jutted sharply out over his haggard cheeks.

Restrictive modifiers

(a) adjectival modifier
левая/правая скула the left/right cheekbone
Правая скула у неё была разбита до крови. Her right cheekbone was bruised and bloody.