Super Saiyan Rose eyes are shown to be pink sometimes and other times grey. Is there any reason for this, or it's a design mistake?
The coloring of Goku black's eyes is pretty inconsistent. It could be a design mistake however, I do not believe it is. My reasoning for the same would be
- The Grey Eyes are similar to that of Zamasu's. Since Goku Black is basically Zamasu, Goku black's eyes would've intentionally been colored grey.
- If you look at even the Super Saiyan transformations, the color of Goku's eyes are Green, blue or red and it depends on the animation/animators of that episode.
- Whenever Goku Black's eyes are pink, it is when he's powered up(In the sense, his aura is glowing). So I personally believe it was just incorporated by animators for visual effect
There isn't any factual evidence to precisely answer this question. However, this is the most logical reason I could think off, based on the amount of information available.