There is something about fluttershy that always get's me. She makes me happy. Excited enough to study the world. Should I do It, yes? But it's for a cause. To take care of this universe and to make humanity happy.
It's a rather interesting piece with composition that seems pretty solid. I would say it's pretty expected if you closely imitate another artist's works, but be very careful about imitating another person's art very closely. You can unwittingly imitate major mistakes in their works as well.
Looking around, I found the art which the background was based off of: [link]
What really sticks out is that Angel and Fluttershy are severely under-rendered, though original art is the same though not as much as your derivative work. Angel is a flat color where he could be rendered out to be more three-dimensional. You could also consider detailing the hair to match the detailing level of the grass.
Another, less obvious mistake from Moe's style... he stays true to MLP's anatomy and uses symbols and lines to draw facial features. It's a slightly different art style than the other art style he uses on his backgrounds that doesn't necessarily rely on symbols (like scribbles for grass or a green blob on a stick for a tree).
The clouds are probably original to you but it is incredibly blurry compared to other elements in this piece with more clarity. Moe's approach to clouds vary to what he needs it for (as a cloud, versus using it as fog) but the cumulus clouds he does isn't this blurry. He renders his clouds in a painterly way so you can see distinct solid blobs of color. RL clouds are generally much sharper and not super blurry as well, so blurry clouds probably go better with a blurred background.
Pretty much, I don't think this piece by itself is bad (though copied art is less satisfying anyways) but expect to be imitating other artist's mistakes when you're doing the stuff you're doing as of now if you're not entirely sure of what to watch out for.
First thought: definitely copy of Moe's style. Although I believe simply copying the same things from his picture doesn't do the thing - the colors are too same, while the shape (the little colored brush strokes), which defines Moe's art for me, is missing. He uses for example three colors for a rock, but he makes the form solid - in this pictures are strokes, which don't "pass in" the image (right lock, the black stroke in the middle rock in the background).
Still my heart jumped with joy upon seeing this, and I would like to see someone trying to learn as Moe did. My goal too