quick concept trying to make celestia-twilight look not so ugly without losing the older goddess-like look.  
 
plus two other concepts for hair shape  
 
I think her hair just looks… bad in the show. I know what they were going for but they missed the mark pretty badly… it ends awkwardly cause it wasn’t planned to be like Celestia and Luna’s, where they end at kind of a point. Instead it just looks like some sort of… fabric sheet that moves unnaturally. also the “bangs” on canon older twi look HORRENDOUS. Plus I think the stripes are too small and awkward. Also changed the wing shape, cause they went through the trouble to give her unique wings as a normal sized pony, then threw that away when they decided to copy and paste Celestia Body™ onto her and it just doesn’t look like Twilight. Celestia is so long, and it totally works for her! But not for Twilight, so I also made her body just a touch shorter and thicker.  
 
(traced over a reference image cause this is just a quick thing)