Regarding the pose...there are many potential explanations:
1) Snakes in my area have a defeatist attitude since wholesale slaughter is common. They are expecting sudden death so they figure "why bother?" Every species of snake in my neck of the woods is perceived as a copperhead with an AK-47.
2) Most of the snakes are really competitive since a few from my property have gone on to be successful. If you walk into the woods here, a snake will pull on your pant's leg, hand you a resume, and request to pose for a pic.
3) The snakes are fans of high quality blades and are honored to have a picture with them. As a matter of fact, the snake on the right asked me if I didn't at least have a Busse to pose with
On a serious note:
As Mistwalker said, copperheads are the most common venomous snake in eastern TN. It is about impossible to find a timber rattlesnake. I have one on my property that has been there > 10years but haven't seen him in a good while. The lady who lived in my parent's house in the 50's died from a copperhead bite to the neck. I have only been bitten once by a copperhead that I stepped on (partial envenomation) and once by a large timber (relatively dry bite). Have been bitten by a nonindigenous Fiddleback once and Black Widow x 2.
My kingsnake population has disappeared so I have been seeing more copperheads over the past 2 years.