These are one of the species of a book concept set in the far future, they are a species of Neo-Humans that evolved to live on Uranus. The two characters are a family and they are celebrating a solar system wide festival celebrating life.

In the festival, red, yellow and green are often worn as the colours represent specific things that contribute to the existence of life: red representing blood, yellow representing light or the run and green representing nature.

Characters:
Not specified but both character's species are called Homo Urani, and are a species of Neo-Humans

Art by me