鲜艳 (xiānyàn) describes colors that are bright, rich, and eye-catching, like vivid flowers or clothing. It focuses on the visual impact of color, unlike 鲜明 (xiānmíng), which also means 'bright' but extends to opinions being clear-cut, and unlike 生动 (shēngdòng), which means 'vivid' in a lively, expressive sense (e.g., a story).