While thinking about the Janus Fey I thought it might be an idea to do a few "Janus" variations in Google Images and see what falls out the other end as regards inspiration.
Janus tat. I like the blue skin it reminds me of Hindu deities/avatars and I think the Janus Fey should have pale blue skin like this.
Celtic Janus. That's quite inspirational as well.
More pale-blue skinned Janus stuff. Again this is probably what the Janus Fey look like.
Wrong Janus but I don't give a stuff.
Hmmm... Definitely the wrong Janus.
Two-headed Giant Tortoise (called Janus). Stat him up!