Pearl ash quarter looks soft and pretty online. I've gone with dulux white duck in our house. Full strength in the brighter spaces and quarter strength in dinner hallway. It has a slight green tone which suits the garden outlook.

Yes, Antique White USA is a bit dated, and it used to be the go-to colour for anybody painting a rental property. Tired, cliched and your painter has probably done a hundred homes with Antique White USA. Don't listen to your tradesmen when making your selections. I would be looking at an off-white with a slight green undertone to soften the terracotta and provide more balance. Keep the green undertone subtle and understated. Get paint samples of the following Dulux neutrals to see how they work against your terracotta tiles : hog bristle, hog bristle half, buff it, buff it half. Best of luck, Dr Retro of Dr Retro House Calls

We are in midst of finalizing a exterior wall color our internal courtyard/lightwell. any recommendations for what would work. Plan is to have a few wall climbing plants to give it a garden feel. Ideally an effect paint would be perfect.

I would just paint the same colour but in a semi gloss