I would do black with some nice black planters on either side of steps to bring it together even a black door maybe.

Gray paint with white trim

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I found online

Gray paint with charcoal trim

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You don't need punch colors as much as you need to make the colors you have tie the house together. Simplest choice would be a brown red ( lose the red/maroon completely) so it accents the brick and body colors. You don't need to do much else. A punch color for the front door would be great if you want more color. The house is almost there and with this slight color change will look whole and lovely.

I also love the house. It seems to me to be a mission style. I think I would go with a charcoal color for the window box & front door. What do you think? Or since the downspouts are dark brown perhaps that would be better.