I present to you this question: Did Moses have horns? (I don't know what Daniel Mitsui's authority on this matter is, other than that he's at least a well-informed amateur student of religious art, and sells his own religious art.)
On the one hand, you'd expect someone who spoke with God to shine, not sprout horns. On the other hand, not all horned creatures are evil - unicorns, for instance. (I'd argue that, if Moses had horns, it would refer to the ram which God sent to Abraham, since both were God-given gifts which prevented the Chosen Race from getting exterminated.)
Of course, it doesn't help matters that this statue of Moses makes him look like Zeus in the process of having Athena pop out of his head..