That looks really cute
My three have long hair.
If I don't keep it fastened up it either gets full of dinner or they chew the end off when they're playing with toys.
So I either tie it up with a little latex band or just clip it back with a tiny hair slide. I bought some great tiny ones in packs from Asda & Morrisons. Some are shaped like little bows, others are rabbits, flowers, birds on a little branch, all sorts & different colours.
I also have some of those tiny stretchy towelling bands, some even have little bows attached, that are made for babies & toddlers. I picked them all up cheaply, in packs, in the supermarkets & Boots or Superdrug.