Good use of the photos. The angle of the two riders to the right is good, it really looks like they're angling with the river. Good placement of all the Nazgul, though the one in the foreground does seem a bit added on...it may be the lighting. The shadow under the horse looks Photoshopped as well. I personally think the piece would flow better together as a whole if the left-side Nazgul were moving with his companions--the two to the right are booking it and the one on the left has stopped. As for the rest of it, the contrast between light and dark is great. I definitely couldn't have done better myself!
This is some great photomanipulation! Not only does everything flow together well, but nothing seems too out of place. At worst, the horse in the foreground might seem a bit "random", and there is a noticeable smudging around its shadow, but other than that it is pretty well put together. Well done!
So real looking! very amazing. make a nice cover to a Book or illustration wrap around cover or fold out. Very cool so I wont look critically at content to a Book series I read over twenty times in this life. I think Tolkien himself would be very impressed notwithstanding any tweeks he might suggest.