Painting the foyer a much lighter shade of the same blue color of your dining room would be worth considering. If it will fit above the wainscoting, you could have the entry mirror replace the mirror and other items you already have on that one wall in the dining room. As is, that dining room wall is a bit "busy". Is there an empty corner in your dining room not in your pics where you could add modern wall hung corner shelving for displaying your plates -- a solid wood version of this: https://www.walmart.com/ip/Wall-Mount-Corner-Shelf-Modern-Decorative-Bookcase-White-4-tier-Corner-Shelf/466931732

I think your house in blue might work better if the door and the posts and trim were buff or beige rather than white or unpainted wood. And I am also wondering if you should do a mock up where you paint the underside of your overhang a buff color (treat it like trim). Part of the problem is that your brick and blue are 2 colors, and limiting yourself to 3 would be best. But you’ve added 2 – the door/porch posts + the white trim. If you are in love with the raw wood look, then I would play around with the idea of getting a raw wood garage door, and maybe even raw wood sliding barn shutters for the windows… I’d be looking at these ideas on mock ups — maybe they wouldn’t work. you might find this useful to look at in fine tuning your choices of blues https://thecolorconcierge.com/best-exterior-paint-colors-red-brick-homes/

The color of the house CAN impact the interior temperature in older homes. From the Lawrence Berkeley National Laboratory: "'Repainting the exterior walls of pre-1980 buildings – whether homes or office buildings or stores – with cool paint offers the greatest benefit because they have the least insulation,' Levinson said. 'And that’s not difficult to do. There are many light-colored cool paints in local home supply stores.' While there is not yet a formal, universal definition for cool walls, Levinson suggests that lower-performance cool walls should reflect at least 40% of solar energy, while higher-performance cool walls should reflect at least 60%. The study assumed that an average wall that is not cool reflects 25% of sunlight." But it also goes on to say "Light-colored walls are coolest, but pigments that reflect the invisible half of sunlight and pigments that fluoresce can be used to make cool paints in a wide range of colors." so you're not necessarily limited to lighter colors. https://newscenter.lbl.gov/2019/07/09/cool-walls-can-reduce-energy-costs-pollution/

Interior Painting - Ceiling, Trims, Doors, Walls.