The concept is good in the Grady sig, but its a little dark for my liking. The Longoria one is dark as well. You cant really see his face either. There is a little too much going on in that one for me. Not trying to sound like a jerk, just being honest.
Could be just my personal preference too.
Keep working at them you are definitely getting better. One more tid bit of advice I can give you is stretch your sigs out. Dont put all that into such a small area. Try making your sigs 400x100 next time. I think you will see a difference.