I have yet to see a style of drawing wings that is prettier than yours, and the impossibly long hair compliments the entire operation. Even on Scootaloo, who is notorious for her rather short mane and small wings, you've created an elegance that is unmatched by anyone else. This is definitely my favorite picture of yours (though your Derpy Hooves one comes a close second). I enjoy how you keep some of the original hairstyle while adding incredible elegance (even to Rainbow Dash, who is notorious for being fast but not so much elegant), especially on this picture.
So in short, I loved it and I wish you'd draw more pegasi. Actually, I have a suggestion (take it or leave it, I'm not the epic artist here, you are). Could you maybe do an alicorn Twilight? That would be EPIC.