I'm with Tallbear, draw it on the gun. Pencil is easy erased.
One suggestion, I think the tips of the inside arc of the carving (around the end of the tang) should extend a little past the step on the tang. You might have to widen the "waist" along-side the tang a little to do that.
It's looking very good. Draw it on and leave it over night. Like they say, if she still looks good in the morning, she's a keeper, start carving!
-Ron