Very good for the first holster. It seems that most patterns I get have to be modified just a little, so don't feel bad about moving stitch lines, etc. White thread is the hardest to keep clean. Even while storing it on the shelf, I keep it in a ziploc baggie to keep dust/debris from getting on it. Might even consider stepping down the thickness of the thread a bit. Also don't forget to burnish those slots.
Make sure to post pics of the next one. Each one will continue to get better.