Gorgons and Images

[M. CVRIVS ALEXANDER]

I saw a photo of one of Sertorius Festus phalerae. One of the images (his lower left phalera next to the horse) is a round chubby face. It appears to have no facial hair and looks rather like a boy instead of a man. Does anyone know who might this image be of.

It's hard to tell from the image, but if it is a boy, it could be a cupid - as I am reading, a known motif for the phalerae between Tiberius and Claudius. One, which is thought to be a depiction of cupid, is found as far as the Ural Mountains near Perm - here is a pic.