This is a cute and very well done picture. The lines are smooth and for the most part, looks show accurate. I can really feel the happiness of this song in this picture, they look like their having a great time!

Vision: 5 stars, the lines are smooth and its very well done!
Originality: 5 stars, I've never seen this done before and I rarely see MLP characters in a group singing (first time seeing Spike, Applejack and Fluttershy)
Technique: 5 stars, The technique is really good, kinda goes along with the vision in my opinion!
Impact: 4 starts, *said why*
This is my first Critique, I hope I was fair and detailed!