It's not like if you put the photo side by side with the drawing you'd just say "He didn't even need to draw anything, they are exactly the same thing."
Tim takes his own photos, and it's just a means to an end to create a certain kind of image. He's still composing it himself. Using models is nothing new, and I don't think it should be dismissed as some kind of cheat.
I know guys who think digitally colored work is cheating, and if you use a digital drawing pad you're not making anything tangible and real, therefore you're not an artist. That if you can't control a brush on a canvas, or a pencil on paper, you don't have any real skills.
I also know guys who think selling your art is some kind of immoral act. They believe artists should only give away their work as gifts. Granted, those guys smoke a lot of weed and smell like patchouli, and one of them still lives at home even though he's 40, but still.
NO, I'm not talking about me.