This is Boromir floating down the Anduin. The horn is still there, so this is before he passes Faramir since I think Faramir takes the horn. Or, possibly, that might have just been from the movie. Anyone know if Faramir recovers the horn in the books?
Here's the color version of this, but I kind of like the pencil sketch version better.
By R Navy. That page links to a tumblr for that person, but it doesn't seem to exist anymore. I was unable to find a current page for the same author.
