This is absolutely majestic. Masterful, even. Just the kind of piece Roger Delgado would have on the wall of his console room. I'm wondering... did you use a reference photo or screencap from the episode as a basis for the drawing? Because if you drew this off the top of your head then I am incredibly jealous.
Thanks very much. I'm very flattered that you like it as I've admired your work for a long time. I did use a reference pic for the face, it was on the back of a TV Action comic that I've had since 1972, and I was just waiting for the opportunity to use it.
I dunno why, but the Master here reminds me of those "Most Interesting Man in the World" Dos Equis beer commercials.
"Daleks have no interest in exterminating him. Cybermen have no interest in upgrading him. He threw a football at a baseball game and still won. He has won video games simply by picking up the controller. He is the Most Interesting Time Lord in the Universe."
"I don't always drink beer, but when I do, I drink Dos Equis. Stay thirsty, my subjects."