colourful; rich in colour
Describes something visually vibrant or having a wide variety of colours. Often used for art, scenery, clothing, or presentations.
Her paintings are colourful and cheer up those who see them.
This market is full of colourful vegetables and fruits.
色鮮やか emphasizes vividness and brightness of colours, while 色彩豊か focuses on the richness and variety of colours.
Compound of 色彩 (colour, hue) and 豊か (abundant, rich). The exact historical derivation is uncertain, but the word follows a common pattern of noun + 豊か to mean 'rich in ~'.