There's some really cool Dark Tower art there, and I thought mayhap I'd share it with ye. (The first one's mine, and the rest are other random people's).
http://sharkgunslinger1999.deviantart.com/#/d5pvdgp
http://ayej.deviantart.com/art/The-D...es-5-344704506
http://browse.deviantart.com/?qh=&se...tower#/d1l7a2v
http://browse.deviantart.com/?qh=&se...chain#/d1rbtg6
http://browse.deviantart.com/?qh=&section=&global=1&q=roland+deschain#/d1jav8b
http://browse.deviantart.com/?qh=&se...a-tet#/d4pib2v
http://browse.deviantart.com/?qh=&se...tower#/d4psdk7
....and there's much much more if you just search 'dark tower'.