Your work is quite stunning! I can see you're more suited for more realistic works than cartoon-oriented ones, but I am very glad you're expanding to cartoon-oriented works nonetheless. Your backgrounds and creatures that are more realistic are your strong suit.



Some of the things I think that could help you improve on Fluttershy herself is:

Her forehead should be a tad smaller, her eyebrow on (Her) right side shouldn't be visible to us, her wings are a tad too small, and I feel that perhaps a reference could've been used to find a proper position for her legs.. as even I can not tell what exactly she's doing. I feel that her stomach, what is visible of it, is also hanging a bit too low as well. Her tail is good as it is, but the hair on her head is a bit iffy. I can see where you tried to keep the hair hanging down on her neck, and the hair laying ontop of her head separate, but I think that line needs to come up a bit, and should be drawn a bit closer to the head.



The hair falling down the side of her face also seems a bit choppy and uneven. the part of it farthest to (Our) right, that's darker than the rest, I think is a bit unnecessary and makes her hair more uneven than it should be. The wing is also a bit difficult to make out where her back ends and her wing starts, but other than that, this is just an absolutely stunning drawing! Beautiful details in the background with the vines and the trees, the plants and blades of grass, even the detailed fur on the jackalope. I also love that there's fireflies coming out.

The only thing I would say is if the grass came up a bit higher on the Jackalope than it did Fluttershy!

Amazing work!