You both are right, and that's what I meant by "good at describing".
Jan van quirm, you're right about Nigel and Conina too, I may have needed some few days more for the deadline to polish that, for sure.
I see each character in Pratchett world having first an "attitude" and a "move". (for example, Vimes is walking (and smoking), as most of the watch, and Rincewind is running/rushing and yelling at the same time), if we (as illustrators) just add the proper accessories, the discworld is so well defined that everyone that knows it can recognize the characters quite easily. For example, there's nothing special in Rincewind face, as I pictured it, but giving him a weird pose, his wizzard's stuff and half a brick in a sock, and there's no doubt at all.
Considering the vast amount of characters, this is quite something typical of the discworld compared to many other books (try to do the same things with other books, and that's rare)
And I must add that I love the work that has been done previously by Kirby, and Kidby.