This is what I call ART, I can't keep my eyes of off it. It just makes me feel like I'm in another world, "Please Love Me" is magic, Fluttershy is a beautiful pony, and they way I see it you make her BETTER. I still can't keep my eyes of it! I could stare at this ALL DAY! I don't know how to to explain this. They eyes, the hair, the yellow, the shadows, the stars, is just............. Perfect. I hope you keep up this kind of work, You are a TRUE artiest. And yes, I will Love you.
Before I begin, I must say that this artwork has much more of a profound effect on me considering that I have a tiny seven week old kitten lounging on my lap at the moment, who is up for adoption as it were.
Anywho, on with the critique!
This is a very nice work overall. The smile on Fluttershy's face is adorable, almost like she's looking slightly up at a prospective adopter to love her. Really adds to the diabeetus of the photo overall.
I think you could have manages to work on her hair a little more. The detail you've put into it is nice, but it seems too angled to look very realistic, particularly around where there are supposed to be curves; I see a few inaccuracies in angle measures between outer hair curve and inner hair curve.
I love the way you made her wing; it looks very realistic, and very detailed [which is my weak point, if you read some of my other critiques ]
Now this is just personal preference, but I love how you've made her eyelashes go in front of her hair. I saw an artwork the other day that had an eyelash in front of the hair, and I liked that part, but they also had a black eye outline in front of the hair, too. That's what I didn't really like about it. So just watch out for inaccuracies like that, even if you haven't done it here.
The shadowing on Fluttershy is nice around the hair and wings, but it seems a bit off around the bottom-right portion of her face. It's almost like there are two spotlights on her at separate angles, when most of the drawing's lights only point to one.
As for the background, the stars are an excellent touch. They really bring Fluttershy into the foreground well. If you can, though, I would change the color to something a little more inviting; not necessarily something that draws attention to the stars themselves, but something that conveys a lighter mood than black does. Maybe a soft turquoise or lavender-esque color.
Besides that, and a few other minor inconsistencies that I don't even really notice unless I look at full-res [also considering that I don't really believe there are any real mistakes in art], you've done an excellent job with this. You have very strong potential to create more fantastic artworks like this, my friend. Keep at it!