6-story-tall mural called "Untitled" portrays Najee Spencer-Young, a 19-year-old.

A mural by the artist who painted the official portrait of Michelle Obama was dedicated on Thursday, portraying not a famous face, but a Philadelphia teen who's overcome personal challenges.

Amy Sherald might be best known for the painting of the former first lady , but her overall body of work represents everyday lives of black Americans.

So it's fitting that the 6-story-tall mural called "Untitled" portrays Najee Spencer-Young, a 19-year-old high school student who has battled bullying and low self-esteem.

Sherald told the Philadelphia Inquirer she chose Spencer-Young as the subject after they met in January through a Mural Arts field trip to her studio. The teen was at first very quiet and pretending to be uninterested, she said, but when Sherald asked for volunteers, she popped right up for a photo shoot.

Amy Sherald is best known for the painting of the former first lady.

"After looking at the photos we took, I immediately knew she was the right model for this mural. I saw it as an opportunity to build her self-esteem as well as (that of) the other young girls that look like her," she told the newspaper.

The mural depicts Spencer-Young in a black-and-white flower print trench coach and mustard yellow hat, looking confident and composed - and very imposing - against a bright blue background.

Sherald partnered with Mural Arts Philadelphia's Art Education Program to create the piece. Three Mural Arts' Art Education assistant artists studied with Sherald to learn her artistic process and work from her design to execute the mural.

As for Spencer-Young, seeing herself as a work of art has been "kind of amazing," she said Thursday after the dedication.

She said high school has been tough but she keeps her head up high and hopes the mural can serve as inspiration to others in her shoes.

"I see a brilliant young lady that is gonna get her life together," she said of her image.

Associated Press