Dude, I'm just popping my head in here to say this is fucking awesome. (sorry if you don't like swearing ono)
They're all dressed in clothes that actually suit them, and I love how you made their body types fit the character. i.e. Applejack is well-built due to the fact that she works on a farm, Pinkie Pie is more chubby because she eats so many sweets.
I love the fact that Rainbow Dash is small and slim here - I often see her humanized as being a muscly tall girl to suit her sporty attitude, and although I love that interpretation also, it is refreshing to have some variation!