My favorite is grey. It's not as bright as some of the other colors and if you want a "pop" of color it's pretty good. Brown comes in as a favorite too.
My eyes in the game are grey, even though my eyes in real life are brown. I just like the grey because it's completely neutral, and goes well with my mayor's hair color because it's usually always white.
Since I have blue eyes irl, I usually tend to keep my blue eyes. Sometimes though I feel the need to change them just to match a certain outfit but that isn't often.
I don't know what color my eyes are supposed to be... One of them is steel blue with brown central heterochromia, and the other one is slate green with brown sectoral heterochromia. ._.
Both my Mayor's have grey eyes, I really like that colour. I'd have them the same as my own irl eye colour (dark brown), but the brown eyes in game are way too light and reddish and I'm not keen.
all my life ive thought I have hazel eyes, but ive just looked online and been informed that I have green eyes.. (Green+brown, whereas hazel eyes are typically blue+brown)