dude, what are you talking about? You have always had a very unique style, it's lovely and i honestly am a huge fan of it
If i had to nitpick on anything, i'd say sweetie's horn looks a bit off, either the orientation or the position is a bit off...but that's such a small issue that it's not worth to worry about.
The scale of the characters looks pretty good to me and i want to say that you have some incredible lines, especially for drawing in a traditional media. I also love the little crosshatch thing you do to fill in colors...and of course i love the soft and plump style you have going on! It really makes everything so much cuter!
So please, don't overthink your drawings too much, trying to get better and self-critique is good but don't let it get under your skin
Also yes, i loved that episode too, i think that's the one that changed my view on Rarity's character