Witch is not a term exclusively referring to females. It is only modern pop culture that has made so many people think it is. I myself am a Wiccan, and a male, and I do not go around calling myself a wizard. I am a witch.
There are so many details that make me want to look at every corner of this picture. From the potions on his belt (lol) , to the spell he's casting effecting the air around him (and even his eyes), this is pure greatness.