This character is an artist in the medium of painting.
Painting is the practice of applying paint, pigment, color or other medium to a surface (support base). The application of the medium is commonly applied to the base with a brush but other objects can be used. In art the term describes both the act and the result which is called a painting.
This trait is for characters that are creating paintings as a form of art, do not use it for someone who paints the walls of buildings in a single color as a job.