I've seen tons crossovers involving My Little Pony: Friendship Is Magic, but this by far the cutest thing I've ever seen. I like how you made Fluttershy glow in the sunsetting background, which makes her stand out well. The only thing I could wish for is that you could've added her cutie mark somewhere in the picture (like on her top or as an accessory or something).
The little story behind this pic is sweet! I just hope Danny would change his mind about leaving fluttershy and stay in Equestria or whatever place there in
You did a wonderful job though