I have been thinking about making a witch (Wicca inspired) for a long time.
When I think about the witch I want to make, it is a shady and dark looking character wearing vampire armor or forsworn armor, though I will use atronachs instead of necromancy, because elemental creatures would probably fit Wicca more. Aswell as heavy use of destruction magic.

Anyway, since she is good moraled, I doubt that she would follow Daedra as much as other witches. Aside from Azura, I don't see any Daedra she would worship. Perhaps she would worship certain divines such as Julianos and Kynareth, but I'm not sure. And since she is a Nord, possibly Talos?

And here are her skills, not sure if it can help me with this though:
Destruction
Conjuration
Light Armor
Alchemy
Enchanting (?)
Illusion (?)
Alteration (?)

(?) = Not sure.

So yeah, do you possibly know any deities that would come to interest for a witch with good morales?

Julianos, or maybe Magnus.

Dibella.

None of the nine divine, they are imperial gods

http://www.uesp.net/wiki/Lore:Nord#The_Nordic_Pantheon

Kynareth/Kyne.

Yeah, I thought about Dibella. Good moraled witches probably appreciate love and beauty.

Kyne.