I like your carving. It didn't look like you were struggling with the tool. The shape of the gun is really good, too.
That said, these tools are the hardest things to sharpen. I start by truing up the inside Vee with a lap of brass filed to fit the vee, then charged with diamond compound.
I stone the outer surfaces of the wings very carefully, always watching that I don't take off too much metal. Sometimes I think I'm OK, but what I have is a big burr, which just chips off on the first cut. Very frustrating. But once you have it, protect that edge with your life.
I have taken up to 2 hours to get a tool sharp. What a pain these parting tools are.
The parallel lines along the forestock are a little wiggly. You can cut them really light with a parting tool, and then file them in with a long checkering file.
Nice gun.
Tom