Oh, no, Run horse, RUN!!! Excellent job.
At first I couldn't make out the hand, but after some looking, I was able to see it.
I suggest you add more shadowing to the picture. Not details in the cracks of the stone to convey stone, but how light would be reflected or blocked if you were in the perspective of the horse or just were the person is able to look up to this giant.
It really makes for a wonderful piece to look at, but it takes a while to be able to notice all the items in the art piece without it blending in altogether.