For your first horn, you did very well. I'm sure in the period that many horns used were not nearly that good, except for the work of more experienced or professional Horners.
Your horn reminds me a lot of The Oldest authenticated artifact owned by The U.S. Marine Corps Museum - a "French and Indian War Period" style horn with two Revolutionary War Marines somewhat crudely scrimshanded on it. Your scrimshanding of the hunter and dog actually is a little better quality than the two Marines on that horn. For clarity, though, that horn is a natural brown and white color. Now, considering the Colonial American Marine Corps did not come into being until an act of Congress on 10 November, 1775 - I was a little surprised at the earlier styling of that horn when I first saw it. However on reflection, the French and Indian War ended only 12 years before the Revolutionary War Period began and sometimes some of us tend to forget that.
Legend has it The Marine Corps' first "Recruiting Station" was Tun Taven in Philadelphia, Pennsylvania, though it MAY have been the "Conestoga Waggon" Tavern in the same city and owned by the family of our first Commandant Captain Samuel Nicholas. Recruiting for the American Marines began in Philadelphia in December 1775. The mother of our second Marine Officer, Captain Robert Mullen, owned Tun Tavern and recruiting began there after Captain Mullen received his commission in June 1776.
I mention these things because that earliest authenticated Marine artifact Powder Horn, in "so early" of a style, most likely ALSO came from Pennsylvania and probably from the area of Philadelphia or at least some Marine Recruit brought it with him or made it or at least decorated it after it was issued to him. (Unfortunately, the owner's name was lost.) We know they had a hard time getting cartridge boxes for those first Marines and many of them were initially outfitted with bags and horns. Now Philadelphia was considered a large city even then and "up to date" as Boston or New York. If such an "Early" style of powder horn was brought along with a Marine Recruit or especially if it was issued to him, that tells us the earlier style had not gone out "of fashion or favour" even around Philadelphia.
Your ancestor being from a further western county in Pennsylvania, might well or even probably saw "French and Indian Style" horns as he grew up and his horn may also have been in that style. Of course, there is no way to be sure, but it is entirely possible your ancestor owned such an "Early Style" of powder horn and used it during the Revolution.
Gus