So you want to make a sculpted
head and neck of a snake to fit onto the end of a walking cane (or actually more like a staff)? ... not that you want to make a polymer clay "cane"
with an image of Lucius Malfoy's snake or his whole staff running through it?
If so, are you just wanting to know how to sculpt a snake with open mouth, or how to handle the fangs (prebaked and inserted into raw clay head would be best), or how to use an armature underneath (or whether one is necessary), or how to do the neck decorations in your pic, how to attach to a separate staff or how to make one with clay, how to simulate silver, etc.?
And how big would you want everything to be?
As for specifically making snakes
with polymer clay, here's one lesson and link to its examples:http://www.polymerclaycentral.com/mikeb/OldOddStf.html
....click on the two snakes for close-ups
Here's Mike's lesson for making them (the particular snakes in that link are covered with cane slices btw, but you could just ignore those parts of the instructions):--form a long rope of scrap clay into a triangle log, which is fatter in the middle and thinner toward each end (his snake was around 12" long?)
--make a cane of your choice (his was ~1" square)—you could use a Skinner Blend instead
--cut slices and butt together in 3-4? long rows on table (on waxed paper?); reduce (lengthen) the cane (thinner) before slicing as you approach the slices for the ends of the snake--to taper the snake shape
--add a lighter-color strip on each long side (will eventually cover tummy and a little will show on each side of snake = 1/5 + 1/5 on each side);
--put a flat side of the triangular scrap log-body onto the slices, and pull the rest up around it; remove excess plain stripe area, and roll to smooth the seam.
--form head in a thick triangle shape
--for eye: press white clay into the hole of a large glass seed bead; turn sideways and will look like a vertical slit of white; press eye onto the each side of the head.
--shape snake body (in multiple curves, or whatever) and prop the head up on a small block or wood, etc., while baking for most realism
(--if you need to reshape snake to make it all lay flat on the bottom after baking, put hot water on it, then weight while baking and cooling again)
tip for open-mouthed
simple snake or other animal:
... make the head first; then use a wide blade to slice from the front of where you want the lips to start back to where you want the mouth to end; pry open the mouth gently, then do any additional forming or adding of teeth or tongue that you want...that's what I did for these dinosaur heads except I didn't pry them open very wide or add anything extra:
Snake heads are shaped a lot like dinosaur, "dragon," and other reptile heads, so you could also go by, or simplify, lessons for making scary versions of those (here are some linked to from my site):
Plankspanker’s lessons for dragon head, teeth, etc., & a body formhttp://www.geocities.com/Area51/Shire/6883/draghd.html
pics, various dragons:http://www.mysticalis.com/galleryall/dragons/index.htmlhttp://pcpolyzine.com/0301january/0301fantasyart4.html
And there are various ways to make teeth and snake or dragon skin from this page:http://www.glassattic.com/polymer/sculpting_body_and_tools.htm
(...the categories called Teeth
But meanwhile answer some of the questions above so we can understand more of what you want. (You might want to change the wording of your subject line to indicate that you want to sculpt the head/topper, not to make a sliceable "cane" of it).