random guy, Aoi Ogata on ArtStation at https://www.artstation.com/artwork/oW48O
pixiv is an illustration community service where you can post and enjoy creative work. A large variety of work is uploaded, and user-organized contests are frequently held as well.
pony tail, Aoi Ogata on ArtStation at https://www.artstation.com/artwork/L8qaK
art and girl image
Pixiv Id 8068977/#2114022 - Zerochan