Here is a tutorial for a messy fishtail bun, from All Day Chic:
In this tutorial you will find how to realize a messy fishtail bun in a simple and quick way. Follow the steps below for a great result:
1. Split hair into two equal parts: aleft one and a right one.
2. Start braiding the hair from each part. You will obtain two lovely braids.
3. Secure them with a tiny elastic band at the end.
4. Continue with the bun by twisting and folding one of the braids at the back of your head and fix it with some bobby pins.
5. Roll the second braid over the first one. Put bobby pins to fix it and you are done!