Well, she did return to Equestria at twilight. The cutie mark star from the sky sequence. So the episode got ya covered.
Hmm... The expression feels just a tiny bit off, might be because of the placement of the muzzle. However, the rest is rather nice indeed. That's a very bright sun for a sunset, as well, but it can be forgiven. 's a nice night sky above, and the general lighting on the clouds is not bad. I like the shading on the towers. I also like the shading on Twily's body, as well as how you colour her entirely in shades of purple. Not a bad depiction of her feathers, and it's some rather fine flowing hair here. Her neck feels a bit too thin, but the way she holds her hooves being so cute makes up for that. Not a bad picture. Well done.
I think what went wrong with the muzzle was I referenced a screenshot of her smiling, but the smile wasnt as wide, so whereas the rest of her face is in the same position, her muzzle makes it look strange. I might tinker it later if I can.
Thank you so much for taking the time to critique this!
I actually think moving the nose a bit to the right, closer to the viewer and the center of the image, and showing more of her mouth would do the trick. As it is, I think her muzzle seems like we're seeing it from a more oblique angle than the rest of her body.
the only way to do that would be to redraw the entirety of the pose then redraw it, but I really dont have the time to do this entire picture again, So thanks for the help, but I probably wont be redrawing this.