I like this look too. Go for it. Forget "fully painterly look that abounds in most concept art." YAWN!
Here is an artist that has been an inspirtation to me lately, Shaun Tan. I especially like the drawings for "The Arrival".http://www.shauntan.net/books.html
... and the trailer for his short, animated film, "The Lost Thing".http://www.shauntan.net/film1.html
Great work Tom. Yongwoo at Heavy Iron introduced me to Shaun Tan. That Lost Thing looks really cool.