I just found a way easier method, after hours of frustration with the game (maybe ever need some slight swearing) that you can change the Childhood Heart hairstyle to the sunflower with just a bottle of orange dye.... Who the frick knew...

I have been asking the same thing, I have tried everything to make the level work otherwise, but I fail with everything. It's impossible to get it through an achievements and I can't get it through the Pavilion of Mystery or Pavilion of Fantasy, I don't want to spend all my in game or real money on it either...