For example:
* 100 cm x 80 cm (meaning the painting is 100 centimeters wide and 80 centimeters high)
* 24 inches x 18 inches (meaning the painting is 24 inches wide and 18 inches high)
Why width x height?
* Consistency: This convention is consistent across different art disciplines and cultures.
* Clarity: It avoids confusion as to whether you are referring to width or height.
* Visual representation: Reading width x height aligns with the way we typically view images (horizontally).
While some might simply mention the width, it's best practice to provide both dimensions for a complete understanding of the painting's size.