It looks so much like Paul Kidby style for me... Even Gorlum resembles The Death of Rats somehow. And yeah, I appreciated the light bulb But I didn't understand yet why 'red'. Because he wears Santa's costume?
Yup his costume is red for christmas I loved Josh Kirby's art on the early Disk world novels - crazy, insane stuff and it took me a little while to adjust to Paul Kidby's work, but now I totally love it!
For me, it's hard to distinguish and appreciate all the details of Kirby's works, Kidby's style looks more simple... and Kidby's visualisation of Pratchett's characters is so close to my own imagination. So I'm very glad that there is so perfect illustrator as Kidby. That's a matter of taste, of course.