Yuuuum I love the style of painting you used! It looks so dream-like.
I really like how the colors are pastel, but they don't shout out "happy". Usually bright, pastel-y colors bring about feelings of happiness and energy, but here they are calm. Maybe because they aren't overly saturated and vibrant for the most part?
Fluttershy's expression is also nice. She looks very pensive. I'm not a huge MLP fan, but I've seen a few episodes of the first season and Fluttershy always struck me as being more lost in thought than the other ponies.
Aaah thank youuu <3 I really appreciate that - I had thought "oh aren't these colours a bit too bright?", and the colours do ironically make people happy for a melancholy piece. I think you're right about Fluttershy I think she's possibly the most pensive of the characters :3