Had voted this as a 7, going to explain why it isn't higher.
It's funny, for some reason this shot has really stood out for me. I think I'd have preferred to have seen this desaturated to look more B&W or greyscale. I do like the grain on it, think it adds something extra to it.
I copied the shot to my PC and had a little play with it (hope you don't mind) I desaturated it, ran neat image over it to smooth out some of the grain but then sharpened it. I then added a thin black border round the edges. It made the scales stand out a bit more, stopped the right hand side from fading away.
As I said, I do like this shot, maybe you don't agree with the changes I've suggested etc, PM if you like, but I personally feel a few wee touches in PS would have helped.
The image is a bit noisey, probably due to low light but I wouldn't take any points away fro that. Might be your equipment, and maybe you don't have Neat Image, who cares? The important thing is you took this at a nice angle, it's a good subject and since it's shot through glass, the focus isn't too bad. I think if you had more control over the environment and light, this could have been a lot better but it's still nice.
This is very nicely done, although there is a bit of grain. I am guessing you used a high ISO. Just a tiny little touch of NeatImage would help. Gives me shivers to be this close to a snake!
Since I am lacking in technical skills, I cannot give helpful comments. I am strictly a photo buff who is trying to improve, but as to telling you what is wrong or right, I am in no position to say. I am simply voting based on whether I like the picture or not. Sorry, maybe someday I will be able to give helpful advice