Sophomore Natalie Merhib has been sharing her art with her 1.2 million followers on TikTok since May 2020, and is now adding pops of color on the walls of schools throughout Londonderry with her murals.

When she heard a fundraiser to promote breast cancer awareness needed volunteers, House 4 Assistant Principal Katie Sullivan wanted to help. She thought to herself, “I work in a high school, and I bet...