I think your conceptual designs are pretty good, i dont see anything that really stands out as red flag wavers...the things i have noticed are more in technique...now bear in mind, im a picky little snot, so take it for what its worth...first, it looks like you have the leather way to wet when you are forming it...after i have my holsters all sewn up, it gets a quick dip in warm water, maybe 5-7 seconds max for 7-9 oz leather, then i let it sit for a few minutes before i put the gun in and start forming...when forming, you want to rub all of th eleather and not just the areas you want to recess...using a rubbing stick or a bone folder will give it a more uniform look...your stitch length looks a little on the long side...i like 5 or 6 spi for holsters...if you dont have a stitch length wheel, use a ruler and mark a hole every 4mm...this works out to 5 spi...try to make your stitchlines connect and flow a bit more...even sharp curves look better than 90 degree turns...sometimes it is unavoidable, but try to minimize it...edging, even on IWB's, is very important to me...spend alot of time on them and read some of the tutorials on edging here...good luck and have fun...