As many have said in the comments below "Beautiful". The white outline around both human and pony Applejack really make this picture pop and gleam. Pony Applejack's facial expression is "downright appletastic" you feel her sense of pride just from looking at it. Proud country girl who works hard on the farm. Flawless by my standards.
Human Applejack is just as amazing, we still see the proud southern grace, but now we also grasp a sense of neighborliness from her. She tilts her hat and lays a hand on her hip as if to say to us "Well howdy, welcome to Sweet Apple Acres" and I know that I'm in for some good ol' fashioned tasty apple treats as well as some of the best hospitality this side of Equestria. Everything fits here, from the way you drew her body shape, her outfit, even her cleavage works here. It's that southern classiness. The gloves are a fantastic touch.
Nitpicks: The "J" on her belt is backwards. (The A probably is too, but since it's such a symmetrical letter you can hardly tell...and I assume that wasn't on purpose, it probably just flipped somewhere in the post production process) Pony Applejack has no freckles. (HOW COULD YOU?! Lol just kidding it happens) A few of the apples in the background look a tad deformed. (Really grabbing at strings here...no big deal)
Again, you could see, (other than the freckles) I was really searching for things to nitpick. This picture is fantastic. Really excited to see Rarity.
Also, once the Mane 6 are done, will you be doing any of the other characters? You've done these so beautifully I'm quite interested in seeing your adaptations for some of the other ponies.
Lovely! Just lovely! Her pose, her smile, the color you chose for her... very appealing to the eye! 5 stars for vision! It's very original (in my opinion anyway...). I have seen many other humanized Apple Jack pics, but none were as great as yours! 5 stars on originality. As for technique... not much to say. You style is beautiful! Continue using it! As for the impact... 5 stars! I loved it! Even though I wasn't expecting Apple Jack to be so exposed (don't mind though XD). The impact is great, makes the viewer gaze intently at the picture. It's very hard to take your eyes off such a masterpiece. Great job!