Hey Jmp, so, I was actually wondering where the Nights Watch slept in this place (i figured they slept in the hall upstairs, tbh) . There's no evidence of previous buildings like dorms, despite the hall and stable still standing. I'd like it if you did a few more ruins, maybe what remains of cabins or bunkhouses, and then I'd say maybe do something with the surrounding areas. Maybe to the south there's a ruined hamlet or so.
so, onto the critique of the hall itself. I agree with waz on the stable being too intact and the logs. I also think you've far too much furniture and banners. Anything the nights watch didnt take would've been salvaged by the brothers on the wall from Castle Black or by the peasants close by.
Another thing, the snow should be built around it, part might even be buried, depending on snowfall averages in the narth. The snow builds up and jsut keeps adding and gathering in the corner, like sand does.