A very nice representation of an Early Philadelphia screw tip Tim? I see your earlier response to Brian that the internal threads are in the horn, not in the collar.
Is the collar pinned and/or is there a plan for a staple in the collar as help to keep the collar in the position? Again, would using only a leather strap attached in the throat area be secured enough without use of a staple?
Overall, a very nice rendition. I like it!
Tim, do you have a 'stand' to use? Sometimes it's hard to get a feel for the horn shape when only laid against a background and use of a prop of some kind might help with improved definition. About the only suggestion I can think of Tim.
Gary