I like the text and the way the team name, position and number lay over the player's name. Nice details and color use is neat. Not sure if it screams Cowboys though? Not that it really matters.
Yeah I threw on some photo layers to give it a blue look. Other than that I wasn't sure how to Cowboy up. Unless the logo is on a helmet or jersey already, I find it hard to use it and maintain the theme of the sig.