Overall help needed

[Tatar88]

Hello Crimson's !

I started this piece a while ago. It supposed to be Jon Snow from the Song of fire and Ice (Game of Thrones) and I need some help with it.
Dire wolf - I wanted it to be mean looking beast, hence the silhouette of it (it's big, perhaps to big)
Jon's face - i don't know, but there's something wrong about it (and I tried first sketching skull and facial muscles)

Obviously I cannot render well metal (even that kind of rusty worn armor) so any tips are welcome

and don't mind the wall behind him - I plan to add snow falling in the baground to bring focus on the characters

about the light - some kind of a camp fire that is out of the image, a bit of struggling wiht the cast shadow think will do the job.

Could you give critique on the whole piece?

Thanks in advance