I guess no, the only impressions we have from Tyrannosauroids are feathered and that one tiny patch of Tyrannosaurus' underside doesn't contradict that the animal was quite fuzzed on the rest of its body.
Yeah, it might be the new lighting, but I am not sure. He just seems... different. Good luck with the lighting, and I am sure you will create many beautiful drawings with it!
Oh, and I meant to say, 'It cannot be said how good this looks.' in the comment above.