I think it fits right but I'm not 100% sure. I will probably end up getting another mask later on.
My cheeks are a little sore in the morning where the mask sits (I have a nasal mask) and my jaws have been sore. I think my jaws are sore from my tongue creeping through my teeth and me trying to keep my mouth closed. My tongue is freaking huge (part of my problem, I'm sure) and I use it to seal off so the APAP works properly.
I get the little puff of air that tries to go into one eyeball or the other but is pretty easy to fix and the bottom of the mask rests just at the top of my upper lip. It seems to fit ok, it's a medium, I just wonder if a small would work better.
On some product or online retailers you can find templates for fitting. Doesn't sound too bad, though, it's normal to take some getting used to. Most of us try many masks before we find the one that fits and usually have to go out of pocket sometimes. Did your equipment provider size the mask for you? I know the line between a small and a medium can be hard to determine.