The scenario is as follows: a habitable planet is being colonized. The conditions are fine, in spite of differences in the parent star. The star is smaller than our sun, either an orange K-star or a red dwarf M-star. You may assume two scenarios:
a planet orbiting a K-star with a normal day and night cycle, not too different from Earth, so humans may adapt. Colors may appear as though looking through Polaroid sunglasses, shifting towards yellow and orange.
planet tightly orbiting an M-star. This means tidal locking. Sun appears fixed in the sky. Timekeeping is essential to maintain the circadian cycle of the colony as a whole, and the sky would be rich in red at all times. Assuming the habitable areas are at the twilight, the colonists will experience the view and colors of perpetual sunset.
I have found these colors appealing, and I like wearing the Polaroid sunglasses for the visual effect. However, I am unaware of their effects if they lasted for the whole day. Does the shift from mid-day blue to sunset colors have an effect, or is it just the length of the day that counts?