First of all, that picture has more than one snake in it. I can clearly see 2 tails. I believe the one with the head in the middle of the pic is not the same one that has most of its body in the foreground of the pic. The one with the body in the foreground has much brighter colors, so they might not even be the same morph.

I think I remember that pastaves have white noses. I'll try to find where I read that.