This is the 5034th most frequent Japanese word.
艶
Luster, gloss, charm, or sensuality.
The word "艶" here is used as part of the adjective "艶やか" (adeyaka), which means "vivid" or "glossy," describing the vibrant appearance of the painting.
その絵は艶やかな色彩で描かれている。
That painting is drawn with vivid colors.
In this sentence, "艶" is used as a noun meaning "luster" or "shine," describing the healthy appearance of her hair.
彼女の髪は健康的な艶を持っている。
Her hair has a healthy luster.
Here, "艶" reflects the glossy sheen characteristic of polished ceramic, showing its use as a tangible descriptive quality.