Very nice job. To chime in with Eaglestroker, it really does help when you pre-contour for the fit. My method is after it is molded and ready to dry, with the blue gun still in the holster, I take a piece of wood 1 ½" wide, ¼" thick and about 12" long and run to through both loops. I then press the wings flat against the wood where it is inserted. It will dry with a natural curve that fits the side a little better for break-in. I have a personal preference to double stitch around the gun, but single is OK too. If this is your first holster, you're on the way to being a pretty good maker. Looks like you pay attention to detail.
Keep it up.