Are my marionette lines a result of volume loss in cheeks? (Photo)

Although you technically have marionette lines you have no volume loss in your cheeks and your lines are more consistent with your anatomy than any age related changes.  In case you were considering having a filler placed in your cheeks or your marionette area I would be careful because I don't think that it will turn out nicely.  Too much filler in your folds will puff it out and not look natural.  I think that you are young and pretty and that you should just go with that and not be so tuff on your self.Best wishes....

Can we establish any rules for augmenting the  lower third of  the face?In looking at the aging lip, there are two important areas
to observe.1) One is the shape of the lips themselves, and, i2)the importance of the support provided to the lower third of the face by dentition,grinding and also 
bone structure. These are all features which require restoration.Not only  injection of the lips themselves but also on volumetric
restoration of the lower third of the face. The lips
should be full and well defined. They should be injected
without blunting the edge of the vermilion border of the
lips or unnatural fullness above the lips. A physician must
also focus on the restoration of the ends of the lips, as well
as the building of buttresses at these ends to restore height
to the lower third of the face, correcting the labiomandibular
grooves and oral commissure. Although dermatologic
and esthetic journals deal with substances for
implantation, these journals do not, in themselves, hold
information regarding the proper goal of lip enhancement.
Instead, the answer is found in the dental literature, in
which many articles have addressed the proper height,
size, and location of the lips as produced by dental restoration.
With the patient in the sitting  position, the lips
should be parallel to a line drawn between the pupils of
the eyes. In regard to spatial location, the upper lip should
be 18 to 20 mm from the nose and the lower lip should be
36 to 40 mm from the chin. As the dental support is lost over time the lips move farther from your lips with the visual concept your nose is getting larger. The concept of this loss of dental support is commonly referred to as "Long on the Tooth!