Artist’s comment:
 
“Mr. Flash Sentry, I appreciate you enjoy being a seapony and I understand it made you feel excited but please, DO NOT destroy my pretty glowing decorations.”
 
“Dang it Flash, they’re supposed to LIKE us!”
 
 
Hehe, you see, I have this headcannon about Flash that he sometimes is a bit childish and easily gets excited about new things in his life. So when he turned into a seapony he was like “Whoooo! I have fins and they are so glowy! And I can breathe underwater and swim so fast, Woohooooo…!” …and then this happened.
 
I decided to base my seapony artstyle on pictures by Jaqueline Anderson I found in my “The Art of My Little Pony : The Movie” book. I actually like those designs more than the ones in the movie. They probably didn’t make it for the film due to their complexity.