Quality work, man. The Kareem Jackson one and the Tate one are my favorites.
I think you need to shrink it down, though. Technically, the sig images should be the size of the one I am sporting. I don't particularly like it, since it's small and tends to make it hard to show a lot of detail...but they want the sig images to all be the same size because it makes the board look cleaner and more streamlined.
Not lecturing ya or anything, just saying. You have some great skills on graphic design there. Verrrrry nicely done.