I confess I quite liked the TV show. Was it accurate to the books? Definitely not. But it was still a good show. I feel it captured the 'spirit' of Dresden well. Achieving that balance of adventure, mystery and a smidge of campiness is WAY harder to pull off than it looks, and they really got it. It was charming. The show also managed to bring new readers to the books, and that's always good.
Warpwind, this isn't a specific Denarian... it's just a generic, unnamed one. Though, I know the exact one you're referring to (I've painted him on an actual cover for SF Book Club). The client wanted an amalgam of lots of different scenes, so we made stuff up this image. You'll also notice Lash hidden in the hellfire flames. She wouldn't have been in the story as early as the Denarian you're referring to either. The whole image is a made up scene, perhaps a side mission that you might only hear about in 'Odd Jobs' or the like.
Leloops, the first thing is, it's not canvas. It's gessoed illustration board. It is extremely difficult (and frustrating) to achieve this level of detail on canvas. I have a lot of free tutorials on my website if you're interested in learning more specifics. If you're REALLY into it, I even have a 5hr. DVD available that walks you through the whole process.