This is a very fantastic work of art you have here of little miss Trixie. She looks quite nice with a flowing, wind-swept mane, now, doesn't she? Nice job throwing in some pretty lighting and fireworks, too.
One of the best things I think that draws me to this picture, besides the fact everything looks amazing is how you managed to make her feel like she has depth, life and three dimensions. The eyes you drew on her are beautiful and have quite the detail to them. I think my only constructive criticism is when I look at her mane and tail. There's white, and while I 'know' there's blue in there it feels overpowered by the white. It's kind of hard to see. But that's all. Otherwise, everything looks amazing