For Whom The Bell Tolls

I've been staring at this thing forever, and so while it's not perfect, I just decided to go ahead and upload it. That line is quoted from the lyrics of Metallica's "For Whom The Bell Tolls," which I'm assuming was inspired by John Donne's "Meditation XVII."

What I like:
The tail!!! Ohmygosh, how smexy. I was trying to follow the rough shape of the original, and I think it turned out great!
I suppose the horse in general, minus the bell.

What I don't like:
The shadow. Ugh. I fiddled with that thing forever, and I still couldn't get it to turn out right.
General blending. Shoot me now.

Sources:
Horse: Colourize-Stock
That Gorgeous Background!: Shadowsstocks
Everything else: (uh, there's not that much else...) handpainted by Wiffink

Critique is greatfully accepted for this piece, just please be nice about it and offer helpful comments instead of demeaning ones.