Comments and criticisms are welcome.
Bruce - I will take you at your word and give to you some feedback. Good and bad. I am not trying to be mean or judgmental. Heck, we all started someplace. With time and practice, hopefully we all get better. Keep at it, it will get easier.
If you ever need help with a sheath, just send me a pm. I would be happy to help you, if I am able to help you.
Good:
1) Your words. It holds the knife. You did well on your measurements to get a good fit. That is a good thing.
2) It does not make you look fat. Another good thing.
3) You completed it. And, to be honest, for a first sheath it is not all that bad. I have seen much worse. Heck, it is better than my first sheath.
4) I like your cuts for the belt. They look uniform. My guess is you punched the holes and connected them with a sharp cutting knife? Just a guess.
Bad:
1) You need to refine your stitching technique. You had inconsistent pulling in areas. On the top side you pulled harder and the stitches have almost disappeared. Bottom side is much better. More consistent pulling. I will say, your stitch spacing looks pretty good. I'm not sure, I cannot tell from the picture. But you may wish to get a groover and cut a line for your stitches to sit down into. Tip: Get a fine tipped sharpie and color your stitch line before stitching. The purists will claim it is cheating but it sure is easier than a dauber full of dye.
2) You used pre-colored leather. I can tell as you failed to finish your cut edges. Dye and finish those edges. Untreated/unsealed edges are a moisture magnet...
3) As a suggestion, cut your leather large and trim down to size. On the top side by the ricasso area of the knife, I can see an uneven cut. Get and use an edge beveler for a more even appearance. You can use your grinder at a slow speed to even out the edges. Sandpaper will work also. It will look neater and have a much better finished appearance. Then dye those uncolored edges, seal them, and use a edge slicker.
4) Another guess. The slot cut for the knife handle was not planned?? In your design stage, you failed to consider the thickness of the knife handle in the leather making process. Been there, done that. Many times.