It looks pretty good man. The idea is pretty damn awesome, and the tendrils coming out of the ground are quite rad.
The only things i would say are, put some chipping on the bell, skaven may worship them, but they are still skaven and therefore it is highly unlikely to be perfect, especially if it had fallen like that. The other thing is try and add some layers to the fur of the grey seer.
But other than that, it looks good man.