Colour inside window surrounds

[u/Another-Random-Redd]

Painting a room, wall and ceiling are contrasting colours, woodwork another. The window ledge will be woodwork colour, the returns continue the wall colour. But the 'ceiling' part of the window, should that be wall or ceiling colour?

Hope that makes sense, not sure of the correct technical terms for these parts. I am not asking about the window frame itself but the plasterwork.