Well, she's fantastic. Technically it's one of the most spot-on anatomy-wise and all that of all your stuff from what I can tell, and the little things like that hoof hanging down, and especially that round poofy snout (if you can't tell by now, I'm a huge sucker for round poofy snouts)... the little tongue, and the hopelessly-in-heaven expression with her eyebrows... it's all just so... cute, but more than just cute. You can just feel how comfortable and at ease Dash is here, and you wanna just flop on top of her in a totally innocent, use-her-as-a-pillow-and-hope-she-doesn't-kill-you-which-she-probably-will kind of way. Or just be in her position, at least.
Her shoulder's too big and the hair doesn't lay correctly across it, her right ear is in the wrong place, her butt is unusually big (as others have mentioned), and I'm really, really not digging the coloration of the thicker lines I was trying to use to help form shadows (which aren't correctly placed in a couple spots and don't match up to the shadows properly).
But someone once told me that responding to compliments by berating what they're complimenting is incredibly rude, and over time I've come to agree. So even though I don't know exactly why people are liking her, I'm glad that they do, even though I know there's plenty I need to improve on.