This girl looks like she's having a great time performing on stage! She has long, bright blue hair, and she's wearing a sleeveless rainbow shirt and a blue skirt. In her hands, she's playing a sturdy-looking guitar, and a microphone stands in front of her. A small amplifier rests beside her, while a crowd of people look on admiringly. To get the rainbow effect on her shirt, I'd pick out different shades of pink and yellow. To color her hair, use multiple shades of blue. The stage she's standing on could be black or brown, and the people in the audience can be various different colors as well. Have fun!