I can't unsee the Sauber-BMW theme, otherwise I would probably rate it better :) I would try something much more striking for a RedBull livery if I were you, other than that the skin is well executed in terms of precision.
It looks nice but i think that they would have classic bull on the engine cover and nose. And the logos could be a little bit bigger, especially redbull text on the sidepod.
Thanks for the review mate! I also tought about these things you said, but I wanted to go for something completely new. So that's why I've chosen to keep it like this.