Not sure if I would go with blue with the red roof.
I’d look at some beige colors.

I think it depends on how much of a statement you want to make. I love a brightly colored, fun, happy beach house, so in this case I would love the more bold colors. I think the red roof color would be fine as a contrast to the blue/green, and maybe lean into it and do a terra cotta door. I'm a big fan of festoon aqua if you want bold and fun, and I like sea salt if you want an almost white house with a hint of color.

There are many different ways to take this depending on how you want your house to feel. If I had a beach house, I'd go nuts with fun pops of color even though I'm a more neutral girl in other spaces. But that's because I get joy from seeing the bright pastel houses any time we visit the beach. You could also look up beach houses in your area for inspiration; see if there are certain colors that compliment your local area and your home style.

Mock ups are very nice...however you have a very prominent roof.

Consider this for the siding in B.M soft gloss exterior finish. Do the garage door the same, but in a semi-gloss finish. All trim in B.M. Acadia White.

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@User I went with the SW Sea Salt & terracotta door (SW Cavern Clay). I think it looks great. Thanks for the recommendation!