I’ve been working on this off-and-on for a few months. I finished coloring it Thursday as a part of my Dionysia.
His beauty is a major point of iconography in Euripides Bacchae, and his purple robe is similarly emphasized in the first of the Homeric Hymns. The horns are in recognition of his title as Bull-god (and the attendant associations with unfettered lust, especially masculine). The significance of the thyrsus and wine should be obvious.