Hopefully this trend of redesigning the Mane 6 isn't dead yet, I still have so many ideas lmao
So this is my interpretation of Twilight. I gave her shorter hair, cloven hooves, and a long tail. Unicorns who bear long tails are either royals or high class and are extremely wealthy. (Remember Twilight's mansion before she left for Ponyville? She had a spiral staircase and her own telescope!)
The writers had an opportunity to give her glasses AND THEY DIDN'T so I gave her glasses of course.
Before she left for Ponyville, I'd like to imagine that Twilight was a scientist of the sort who was also a part time librarian. She would conduct all sorts of crazy magical experiments, some successful and some not so successful.
I can't really explain her cutiemark since I crammed up at that part, but I imagine she gotten it while conducting her first experiment as a foal. She is a very powerful unicorn, but is very shy and introverted. And the rest is history.
Remember, this is MY interpretation of Twilight. You don't have to like it haha.