Overall, I think it's a good design. I'm not a big fan of blocking a holster to death. Rather, just enough forming to securely hold the gun, like this Glock 43 holster.
In my opinion, not only should the stitching come closer to the trigger guard but to the edge of the holster as well. I usually run mine somewhere between 3/16 of an inch and 1/8 of an inch.
The belt slots need to be refined, finished and burnished on the inside.
Burnishing an edge doesn't necessarily mean that it'll be substantially darker, just gives the whole piece a more refined, finished look.