This is a powerfull one, sincerely. First time a picture/ comic make me cry. The way it's drawn have a huge impact on the feelings, mostly, for some reasons, with the muffins. They are drawn in a so simple way... it's hard to explain. and the water droplet on top of "momy" is really what made me burst into tears.
I gave you 4.5 stars for technique because the ponies look strange... Mostly with Twilight's nose and Derpy's human-looking face. It kinda ruin the emotions a bit, but I still cried.
If I could, I'd give you 6 stars for Impact.
Sincerely, Good work!!!