It looks nice (although I prefer your first picture). I'm against the defeatherization of actual dinosaurs, but it's nice to see reinterpretations of Pokemon designs. The collar as a bunch of teeth fits the toothy T. rex like a glove.
Besides, assuming Tyrannosaurus had to have lots of feathers because another tyrannosaurid had them is like assuming the African elephant has to have a dense coating of long fur just because the wooly mammoth had it. It's very probable that T. rex did have feathers and I personally love the idea of a feathered T. rex, but it's fine for artists to speculate until we get some new discovery.
It's fine, Tyrantrum is just amazing though. I hope it has some good base stats because I'm too much of an elitist snob to use weaker pokemon in my team