This piece is very adorable. The expression upon Rainbow Dash's face really highlights her very innocent and childish discomfort as Fluttershy very sneakily giggles at her.
I enjoy that the artist has chosen to recreate something that happened in the show with their own vision in mind, also that the relationship between the ponies is subverted, and in a sense reversed in this scene. As Fluttershy is usually the less agile one and Rainbow Dash is the one who holds the charismatic position. It was a great scene to choose to depict and the artist has drawn the body language and facial expressions of the characters very well that can't help but make the viewer also laugh.
The drawing, just as the show does, carries a very carefree sense of light heartedness, as we know that Fluttershy is not cruel but rather surprised by Rainbow Dash's rare clumsiness. The depiction of the characters, seemingly as fillies, only highness the cuteness level of this scene, and successfully draws out an original style to the artist.
This is probably the cutest thing ever! I really like it! Just so CUTE! I really like how at the description. Just giggle and not helpXDD I find this really fun to look at! Dashie trying to fix this and Fluttershy just chuckles at her