If you are comparing the intensity of color:
* More colorful: This is the most common and straightforward comparison.
* Vivid: This implies a stronger, brighter, and more intense color.
* Brighter: This specifically refers to a greater intensity of light.
* More vibrant: Similar to vivid, but implies a more lively and energetic quality.
If you are comparing the variety of colors:
* More varied: This indicates a wider range of colors.
* More diverse: Similar to varied, but emphasizes the uniqueness of the different colors.
If you are comparing the beauty or attractiveness of the colors:
* More beautiful: This is a general term for greater aesthetic appeal.
* More attractive: This specifically focuses on the visual appeal of the colors.
Ultimately, the best comparative word for "colorful" depends on the specific context and what you are trying to emphasize.