I would try to match the color of the stone for stucco, match keystones and all trim in a creamy white, and then look at some shade of teal green for shutters.

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This is the dilemma you should bump. Go on Benjamin Moore or Sherwin Williams sites. You can upload your photo there and try on colors to match your stone. Is that how you came up with BM 233?

Get some big white poster boards and paint your samples on them so you can lean them against the house at different places and at different times of day and weather conditions. That may help you narrow it down some.

I agree on matching the stone (or sometimes matching the grout is easier and allows the stone to still contrast a bit), but I disagree about teal shutters. I think maybe a charcoal or a dark brown, given the formal style of the house.

Also, which of the red doors is your actual entrance? I'd paint the other one closer to the stucco color, so people know where to knock!

Can you show a better photo of the stone? I agree with the person that suggested the paint apps to give you the color options from taking a photo of your stone. This will help to guide you to begin the process of color selections.

Maybe you should consider going with the color of the mortar???