He reminds me of the red mages from the final fantasy series, they are able to cast various types of magic but can also use swords and fight like a regular warrior. I like the gold and vermilion color scheme you have on his robes. Especially the handle of his sword and the metal hilt guard around it, very convincing and business like.

His face paintings look mystical in nature and almost religious. Are they used as a source of his power? Or are they there simply to strike fear into the opponent?

It's the pattern of his hide, if you mean the stripes on his eyes. Zane loves to intimidate the enemy with his martial appearance, and everyone who sees him is amazed at how much strength he has in his prince's herculian body, inherited from his father.