This is when Mitsuko is at her absolute most powerful; her eyes are bright white and glowing strong, there are brilliant twinkling lights of excess energy pouring off of her. The colors of her light are vibrant and blinding.
The colors are not affected, but there is less of the "sparkles" and her eyes are not quite as bright. This doesn't affect her in any negative way.
The coloring of her light gets muddy and eventually it's only "monochrome", there are no sparkles, her eyes are not glowing. Her "hair" isn't quite as floaty or swirly.
She cannot activate her quirk at this level; she must lay out in direct sunlight in order to regain her power. This level can last days depending on how far she pushed her limits, and if she isn't careful, she can enter a comatose state.
I wanted to show you guys the limits of Mitsuko's quirk! Any resemblance to original characters of other works by other creators is completely coincidental. Boku No Hero Academia is owned by its creator(s), but the character and design of Mitsuko is mine! The artwork is mine, so please do not post elsewhere without my permission. Do not trace, reproduce, or steal in any shape or form. If you want something drawn for you, my commissions are open and they're quite reasonable! There really is no reason to steal!