You open Photoshop/Painter/whatever and start sketching. After many time (months, years...) of training, you (hopefully) will be doing something like this. I used to wonder the same thing. Now I see it's just a matter of training, like anything else.
How on earth did you draw that in an hour or so?!?! Please, if you have any tips or know of any places where to learn how to do photoshop that good, please let me know.
I was attracted to your gallery by that Cassidy werewolf guy picture and now I'm just browzing round in awe. I don't think there's one picture yet that hasn't made my jaw drop in amazement. Your work is really relaly good, and I mean that!
The blue backlight is really good, but what is a lonely christmas tree doing in the lower left corner of the building? It's the only vegetation in the picture and it looks wery odd.
There's something with the perspective in the road that doesn't work, and the upper right corner of the picture is quite dull, make the clouds explode with magic light, that would be awesome.