I am not an artist, but a HUGE art lover. I am a deviantart.com junkie (lots of great stuff there) and I found a small handful of DT fan art. Here are 3 of them, I have more and will try to post the others later. I hope you enjoy:
Lady of the Shadows -- Odetta by ~hardcoremiike
The Dark Tower : The Kiss by ~molcov
Road tu Lude by ~CYNgraph
(This one is originally sized for desktop wallpaper)