I can see what you were going for. Her expression is intense. Determined and brave. You capture her leadership aspect very well here.
Alicorn twilight has been done a lot since the episode aired (and even before then!). It's always fun to see a different take on it! Some people make her sad to be an alicorn, some make her excited. Here we see her ready to take on the challenge!... after a quick book or two, of course.
The only thing is her wing looks a little low on the body, and it looks like it's coming out the top of her hip rather than her sides. Nothing a quick fix can't do anything about. I would recommend just moving it up juuuuust a smidge.