Kind of a boring sig but I say that only b/c: 1, its the Raiders, 2, its b&w...and 3, its the Raiders.
I love the text style of this sig & I love the choice to make the text as big & overpowering as it is. The background is also very, very good & even the subtle things you did take this sig far. The lines in the upper right and the other dim lines throughout aren't major...but effective.
Change your render to a photo of Asomugha in a helmet & this sig is easily 100 times better.