I am told that if you get down close and look into their eye's, from the side, you can tell if they are poisonous. At least that is what Dumb Pete told me.
I don't know where you found him at, but he looks a lot like a timber rattler. They're darker, and they're very mean. They don't see any need to rattle and warn you. I would have to see it in real life to tell more. That boy of mine does research on reptiles and has published some studies in "Herpetologica" and he would know more about it. He'd want to catch it and bring it home. I don't know about those eyes, if it's getting ready to shed or it's just the photo. Ya'll remember this. When snakes of all kinds get ready to shed, the skin over the eyes clouds over and they are essentially blind for a short time. Out of self-defense they will strike far more readily at anything they sense near them. I don't kill snakes anymore. I just pass on by and leave them be.