I am currently done with the base and the bottom part of my snake and I am moving up to its neck. The neck will be about 8 cm wide and it will be slightly slanted. The making of the thickness of the coils will be the same as snake's body. I am going to join 2 coils to give it a more realistic look of a snake. Then after I am done with the neck I will have to do the head of it. I am planning of opening the coils little by little until I reach the width of 11 cm. And for the mouth I want to I am going to take Mrs. Ariani's suggestion and make 2 round half spheres on each side then to blend them separately to make it look like a mouth.