Ohh, what a beautiful artwork, and such a lovely tribute to Applejack as well! She gets far too little love really, I think. Personally, I feel this is a lovely artwork showcasing some fabulous use of color; I love the warmth and richness of it and think you did a very nice job painting her hair (it looks appropriately thick and fluffy, which I personally find much more difficult to do than Rarity's sleek curls, for example). Really great job!
The manner in which you blend colours is so beautiful it's mesmerizing. You really brought out the texture of her hair, it flows voluminously. I'm sucker for orange as well. This is a very warm and soothing painting.