@nobody. Thank you for your reply and diagram.
I get what you're saying...Over the past year, I think my back posture has become a bit straighter because I've been 'barefoot' exercising and wearing shoes, less. This has resulted in strengthened ankles and straighter/more spaced out toes. (I believe Dr. Mew is currently doing research on the form /function of the feet, and body/oral posture, so that will be interesting...) Now, if I stand up straight and look straight ahead in the mirror, the sclera does show a tiny bit.
I think you're right that my posture is changing, but my maxilla hasn't swung upwards/forwards yet.. (Actually, the sclera probably isn't as bad as I imagine...It's not really noticeable unless looking close up. It also seems to go through periods of improving and regressing, which is things adjusting, perhaps) Come to think of it, I've always had a 'tilted upwards' head and I guess my features just adapted to that, even though it wasn't optimal...
However, my side cheekbones came out a bit since I've been mewing. However, I have a tongue-between-teeth thing happening on the right side of my dental arch, so I doubt my maxilla can properly go up/forwards, until that's sorted. Can't for the life of me expand it with my tongue though.