My thoughts on the novelties are; Dragon glass knife looks good, dragon eye looks good (maybe needs to look more evil though?), "Winter is here" is awesome, and we need a "winter is coming" to go with that.
I know the set is "Night King" so you've made novelties only surrounding him, but I really feel like the set would benefit and become way bigger of a GB if you had the 4 main houses sigils in there and maybe a few other things from the series like the hand sigil and such.
I made a few suggestions today, some are simple and some are more advanced. I don't have any experience with making this for keysets, so I don't know how complicated they can be. I hope you'll find something you like, and if there's something you want to use but need some corrections please let me know.
In alphabetic order:
Barathion 1
Barathion 2
Hand
Lannister 1
Lannister 2
Night King 1
Night King 2
Raven 1
I trashed that, it was bad, sorry
Raven 2
Raven 2.1
Raven 3
Stark 1
Stark 2
Targarian 1
Targarian 2
Let me know what you think