They look cute with braces
Some strange reason, when I see young Celestia, I mage the song 'Vacation' by the Go Go's is playing.
Either way...... She is so freaking adorable!
By trying to understand what they do and how, and copying or emulating those elements.
There were also some online tutorials (written and videos) for certain things like how to use the software.
And to a lesser degree also a few books, most important an "anatomy for artists" book.
The most important part though was to practice a lot.
(sorry for my bad english)
I just wanna playfully pinch those cheeks and go; "D'AWW, YOU'RE SO CUTE!!" and give her an apple as a reward for being so cute. Or give her a sugarcube. Pony princesses like sugarcubes, right?