Your room is already divided in two horizontally by the chair rail or the wainscoting.
Paint one room two colors.
Chair rails and wainscoting.
I would use one of the colors as an accent on one wall.
A common two color strategy is to use contrasting colors to highlight the ceiling or the wall.
In this case the darker pink as otherwise the room might be too dark if 3 walls are the dark pink.
When selecting two colors for one room it is important to choose one that is a white or more neutral in color as not to compete or fight with the accent color.
The triad color.
An accent wall is the perfect frame for a wall hung art collection or a single important piece.
Complementary colors provide strong contrasts that are visually striking.
Looking for more balance purple and white is good option.
Purple and white are a good complement.
If someone is interested in two.
How to paint a room with two different colors accent walls.
If you choose to contrast the ceiling making it darker than the walls may create a dramatic effect.
If it is mainly the orange then you might want the pink on 3 and the orange as the accent.
Rules of painting a room with two colors color science 101.
Colorists often utilize a color wheel before selecting a multicolor design scheme and some paint.
Complementary and split complentary colors.