I love this pose. So dynamic and action-ready, yet so graceful and balanced. Just like Twilight herself in such moments. I love the curve of her wings here, a very interesting position that looks just right for the picture. The way you put her legs is great, too; love the shifting balance between her raised left and planted right rear legs. Good shading on her; it might be two-tone, but it's just enough and works very well to define her proportions. I like your take on the hair, the rather large one-sheet-style mane and (quite well-placed) tail look great here, and the way you handle their colours feels good too. Most of all, I like the emotion she displays with everything: that lovely smile, the sparkling eyes, the raised ear (the most expressive ear in the world!) and the pose. Even that spark of magic on her horn works towards it. A very energetic and lively Twilight here, love seeing her like this. Well done, well done indeed!
Ah, wings were really hard for me to get the hang of when I started. But they're so fun to draw! I just love doing all the graceful curves of them. It's definitely worth learning. I'd say the wings are very well drawn for not being used to them