I'm watching you for quite a long time, as you have impressive skills, especially if we talk about those awesome long-feathered wings. I 'cannot into' drawing by myself, so I will never criticize your techniques.
Nevertheless, I can't identify those creatures as any kind of tiny horses, mostly due to head and snout shapes and proportions. That's just my impression. You can take it as a feedback and make things different, or you can tell yourself that it's a 'single stupid uneducated opinion that does not make any sense' and keep drawing in such a way, staying complacent with only positive feedback.
The choice is up to you.
P.S. Tell me something about 'show-like' style for any of those from my favourites, please... [link] [link] [link] Then tell me that none of those are equine.
I've drawn these ponies the exact same way as all of my other ponies, if anything I made the snouts more muzzle-like then I usually do
If I were trying something new, I would be perfectly willing to accept negative comments about it. (about the lines, the lighting, anything...) But regarding anatomy I've done the exact same thing as I always do, so I don't see how these 2 don't qualify as equine and all my other works do. I've always used the same head shape, the same body to head ratio, the same ears, just the muzzle is slightly different on these. And the thickness of my lines, but the latter shouldn't really make any difference.
Ah, all those lovely details! Filly Luna and Celestia are adorable, but I'm really loving the lighting and the background. In particular, things like the bed, ursa, Starswirl the Bearded poster, etc. are really neat additions. Great work!