This feat exists simply to add the supplementary information provided in Chapter 2 of Xanathar's Guide to Everything to a character's sheet so that they can more easily flavor their interactions with their tool proficiencies. It does not function as a standard feat, and is not to be taken as part of an Ability Score Increase.

Proficiency with painter’s supplies represents your ability to paint and draw. You also acquire an understanding of art history, which can aid you in examining works of art.

Components. Painter’s supplies include an easel, canvas, paints, brushes, charcoal sticks, and a palette.

Arcana, History, Religion. Your expertise aids you in uncovering lore of any sort that is attached to a work of art, such as the magical properties of a painting or the origins of a strange mural found in a dungeon.

Investigation, Perception. When you inspect a painting or a similar work of visual art, your knowledge of the practices behind creating it can grant you additional insight.

Painting and Drawing. As part of a short or long rest, you can produce a simple work of art. Although your work might lack precision, you can capture an image or a scene, or make a quick copy of a piece of art you saw.