How must the display of a notebook be designed to edit photos well?

What features should it have?

For Apple, it's the Retina Display, right?

For every display and every monitor there are color charts for calibrating the colors! So set driver and monitor properly and then it should work!

With the notebook / laptop it is only important that this is anti-reflective!

I thought with a mirrored display I have a better image quality and more brilliant colors?

That already! But in the dark area (for example: black background image) you are in the mirror… I do not know if you are pretty, but if I see myself in it, I'm always frightened.