Some change I did:

• I decide to give twi cadence’s body type since the
  timeskip is like 20 years or something I don’t
  remember and not like hundreds years so it won’t
  make sense that she would become as tall as celestia
• I decided to give her normal mane instead of wavy
  one, idk how magic hair work in mlp but I feel like it
  would take a long time for her hair to go wavy like Tia
  and Luna (l think it also need a lot of magic)
• Her hair is inspired by her crystal design and I add
  some tiny star as well cause why not
• Since her crown is a fusion of celestia and luna’s
  crown, I try to add some ref of the sister to the crown
  like the moon and the sun
• Instead of gold accessory, it’s silver and blue cause
  I think it suit her more