After 45 years of carpentry I have never worried about saw/sanding dust. I have heard that I might develop an allergy to walnuts from working with the wood and inhaling the dust. But I have never liked walnuts, so I'm not concerned. In all those years the worst I've had to deal with is getting slightly stuffy.
Check with Maverick Leather in Bend, Or. They have a pretty wide selection and may have what you are looking for.
Maverick Leather (maverickleathercompany.com)
There was a bill passed to prohibit the TRANSPORT of horses for slaughter. It does not stop morons from turning them loose to fend for themselves however.
I started in 7th grade and did it off and on through Jr. High. Got an "apprenticeship" at a hippy leather shop in the late 60s. Did a lot of "fix it" for the guys in my Army unit. Started get more serious about 40 years ago. My son made a key fob for my mom about 25 yrs ago that she still uses and his daughter made her another one this last Christmas. All together I've been at it for 55 yrs.
I would say your biggest problem arises from your "dry" time. I usually wait hours between steps. Sometimes as long as 24 hours. Leather is a sponge and it takes time for things to fully cure/dry.
As odd as it may seem, we get little guys like that up here in the great PNW desert. After a really good T-storm, we get hundreds of little guys like this. They don't have red eyes, but they are much the same otherwise.
I don't do ANYTHING metric, so I have no idea how big your awl is. But it is obvious that you need smaller needles or a larger awl blade. The only time you should have any real difficulty pulling the needle through would be when you back stitch.
From the small picture your carving looks quite good. But your basketweave looks rather faint. And I agree, moving the zipper will help make things "flatter".
Looks like nice work. But I didn't know anybody wore wrist watches any more. I don't think I've seen one in 3-4 years. Most folks just use their phone for a watch.
I've carried a pocket watch for decades, because I can kill a wrist watch in less than a day. Construction is really hard on things.