This is why Pinkie Pie says you should never prank Fluttershy. It never ends well. (Experience maybe?)
You get very close to the show's style in this comic. The expressions are spot on and are something I would expect to see in the show. I especially like Harry the Bear's expression.
I like how Rainbow Dash and Discord team up to prank Fluttershy... at least until they are caught! This is one of my personal hopes for the show; that Discord's relationship with the Mane 6 will improve. This is one way to do it!
This also seems to portray the "big sister" relationship Pinkie Pie seems to take on in regards to Fluttershy.
Good development of story and (?)panels(?) in comics with only one exception. In my opinion, Discord "Escape poof" would be more fun, if we could see his face expression before. Idea about Rainbow Dash and Discord, trying to prank Fluttershy? Yeah, this characters could do that (Imagine this whole comics in actual show). Pinky Pie reaction- priceless. I really like your drawning style. Very similar to show, but with your specific, and recognizable "touch" like face expression or eyes style. Only one thing bother me. Maybe impact of Pinky declaration wolud be better, if she have her Pinkamena Diana Pie hair style.
(?)I don't know proffesional designation for illustrations in comics. I hope I do not make a mistake