Ella - nice, sounds cheerful
Elle - also nice, I find it slightly less appealing than Ella, but it's more unique
Viv - pronunciation unclear. Viev or viv? I think it sounds a bit nicer pronounced as Viev.
Keet, Kaat - both very nice. Dutch, strong and sweet. You don't hear them that often. With Keet, though, there's confusion with Kate. That's why I find Kaat slightly nicer.
Kess - special. I didn't know it, but it sounds funny. Better than the common Tess.
Wies - also very nice! Very old-Dutch, I like that. And fairly unknown.
Fae - nice, but there are many different spellings. Fee, Fay, Fé, Faye...
I think Fae is the cutest from your list! But I think the spelling Fay looks nicer. I actually think Fayé is even prettier, but that's not on your list. Good luck with choosing