It could be because the artist uses filters over the finished picture. The filter could alter the colour so, for example, if your characters eye colour is blue but the filter is a warm colour, it tends to have a more warm colour so it looks more reddish, like violet or so.
Just my opinion as a digital artist, I could be wrong :)
And since it is just a slight difference I thought that could be the case xDdd
Filters can add a lot of environment to a scene without doing too much :D
Filters seem right, lighting / setting could also be the case. Kinda like people with grey eyes that can look green or blue in the light; I’d assume the same for violet I suppose
Yeah, random rainbow confusing eyes could be too random I guess xD
The art is beautiful.. Really.. But Why her eye color keep changing.. It's violet at first.. Then deep violet.. Then blue-violet.. Then blue.. So inconsistent ugh.. I'm crying..
Herdin eyes too though we can't see it properly.. It's supposed to be Blue.. Sometimes greyish.. Sometimes black.. Ugh..