This is a Japanese maiko who is wearing a hikizuri (also called susohiki) kimono and darari obi. Maiko are geisha apprentices.

The color combination I've used is called "fuji" and it is good for spring (https://wafuku.wordpress.com/2011/05/15/japanese-colour-names-seasonal-combinations/ and http://www.immortalgeisha.com/wiki/index.php?title=Kasane_no_Irome). The pattern on furisode kimono, specifically those aimed for children is often very colorful. Here I've chosen to use the following motif: temari (ball that girls played with), sakura (cherry blossom), hiogi (fan), chou chou (butterfly) and jakago (bamboo fence). The long darari obi features two temari and a kamon at the end, identifying the okiya (tea house) the maiko works at. There is also a large obidome (obi cord decoration) at the front and the way that maiko wear their obi includes also a red momi under the obi.

The kanzashi in her hair feature sakura, butterfly and falling petals of sakura. The hair is done in the traditional wareshinobu hairstyle.
More about seasonal kanzashi:

• http:/emusing-emma.blogspot.com/2014/06/seasonal-kanzashi.html
• http://www1.odn.ne.jp/maya/english/kanzashi.htm and
• https://jpninfo.com/35847
  

More about maiko hairstyles:

• http://geishaofjapan.com/fashion/hairstyles/

This maiko is wearing also okobo, as in fairly high sandals, to keep the hem of the kimono safe. This would be done outdoors. Maiko are also dressed up to seem younger, having them wear larger geta helps achieve this.

Other details:

• hikizuri have a padding at the hem (to protect the hem while trailing on the floor and to keep the hem spread nicely), I've added a second layer on the kimono hem to make it plumper
• the collar is folded with the left side overlapping the right (the collar is folded with the right side overlapping only for the dead)
• an additional hiyoku eri (collar) is added (the light purple one between the kimono collar and the white collar) to bring formality. It would not be unusual for maiko to actually have another kimono underneath the top one. Dressing up in layers of different colored fabrics was common in earlier times (for example juunihitoe during Heian era).
• the back of the kimono if pulled down more than common people would
• on the lowermost collar (eri) the color changing from red at the back to white at the front indicates a maiko that is somewhat experienced but not quite senior yet
  
• maiko paint their faces, neck and nape of the neck white. At the back they leave most often two unpainted stripes coming down from the hair and at more formal occasions three. I don't know the reason for this but as the nape of the neck is considered particularly appealing in the japanese culture this might be to draw attention to it. You may correct me on this.
• younger maiko paint a smaller area of their lips red, but as I had two pixels available in total, I painted both of them

Kimonos are a hobby of mine and I hope I've gotten most of the details right! ^___^