(Note: these ponies having both wings and horns represent ALL pony races and i want to represent them as alicorns but since i don't want to indicate they are actual alicorns the horns and wings are detached and white)
Mummies: the stain glass window here has images of two "alicorn" mummies. the background represents their native home environment and where they come from, the sun could represent the same idea that Egyptians on earth see the sun, the night above symbolizes they have connections to a higher force unknown to pony kind, something from above, only they and the other creatures know but will gladly explain what it is to those who are curious.
Witches: this window has a figure that represents the witches, it may be female due to witches being mostly female, but they can be male too. (Though idk if i should call them wizards or something because I'm not sure warlock is the right word) the dress and the green symbolizes the forest, the environment in which they live, the sun and moon is to show they respect both the day and night. the book is the book where all their spells are and the crystal is a VERY special crystal but it's use, significance, and origin will be revealed someday but for now it's just a pink crystal.
vampires: now here is something special but i can't reveal too much but let's just say the entire image symbolizes rebirth. the two bats are the two vampire ponies' bat form.
Wolf ponies: wolf ponies are the most common creature in the AU, so this window has no specific pack but represents all packs. the two ponies and the wolf show the wolf ponies running free in nature and the wolf shows what they can transform into, wolf ponies are active both day and night and can be a wolf no matter what time of day it is.
Swamp ponies: swamp ponies are not related to ponies but convergently evolved a pony like body. the image here shows the home environment there is not much to say but swamp ponies love their home environment and are social creatures and the window represents that, their love of their land, family and friendships.
Immortals: there are very few immortals, and they can be both male and female. so, the pony symbolizes all ponies. the tree symbolizes longevity which fits the immortals in a way, there is not much to say, except i want to convey a sense of majesty if this is the right word.
this music would hopefully get the point across Largest Star – Soundtrack (2020) — YouTube
Spirits: spirits are shown in their final resting places but currently there are only two but spirits in general are treasured by the other creatures due to them being family, friends or otherworldly beings either from equestria or beyond. they are friendly beings and only truly appear during nightmare night or just the fall season in general (the ones who have passed on) others yet unknown show up anywhere in nature, again this won't be raveled until the far future, for now most are unseen by the naked eye.
someday more will be revealed on how they will be seen and why they are so respected by the other creatures. ~
i hope you like the art; this took a while but i finally did it. i don't want to give major spoilers but i have something planned and i hope i will get to do it once i get there. there will be a lot more worldbuilding once i have the chance.