I don't have pictures, but here's a text tutorial:
1. Part hair down center
2. Gather the top half of your hair and put the rest in a loose ponytail so it stays out of the way
3. Put the top half of your hair in a high ponytail, but the last time you wrap the hair tie pull the ponytail only part of the way through; this makes the topknot
3.a. Be careful not to pull the hair too far through or the topknot will be floppy
3.b. If you like you can take a small section of hair and wrap it around the base of the topknot to cover up the hair tie
4. Take the rest of your hair out of the ponytail and separate two sections near your face
5. Fold the end of one of the sections over so that it looks like an upside down version of your topknot, then secure with a hair tie; do the same with the other section
That's it! Her Fire Nation hairdo is much simpler than her Water Tribe one.
I hope this is still useful, I notice you posted this a while ago.