Looks like you have it thought out. I would suggest picking your roof color before you pick your paint color. Paint color is much easier to change over the years. Personally, I would pick a very neutral shade such as grey or black (like you suggested). This way you have many other color options for the color of your home as time goes on. You can find a beige/grey to soften the red in your brick. Versus a cooler grey (Wow that looks really blue next to the top one- but when by themselves, they both look more grey) It will be nice to see how your roof impacts the look of your home over the course of the year and throughout the different seasons. I am not sure where you are located but a north facing home, in the northern US, a grey will take on more of those blue tones. Yes, I would make those attic vents blend in. I am not sure that I helped any. Good Luck!

I've been looking at high end roofing tile websites and one of them has a color expert that made recommendations for house paint colors with their orange/brown roof tiles. Here is a link to some of the schemes they recommend that may give you some inspiration: https://www.davinciroofscapes.com/blog/exterior-color-schemes-autumn/ You can color match to Sherwin Williams brand paint.

I love your MCM home. I particularly love your front door. The garage door is okay, but I do think it would be better as a wood or (plexi) glass type garage door like one of the below insp pics. I also would go with a green gray for your exterior color of the body of your home like one of the green/grays below. If you choose to keep your garage door, then naturally it would be painted the same as your siding or one shade darker of that color. If you do paint the siding in the greens, then change the accent color of your front door to the oranges or even eggplant or some other contrasting color. ^Glass type overhead door ^Garage door that coordinates with your front door.

Gorgeous house!! Truly!! All I would do is paint the top half/ the greenish color of the house. Leave the bottom which looks like a limestone? Beauty! Would it consider a blue door? Like a deep rich almost navy? I’d paint the brick on the garage to match. Or whitewash. And leave the steps as is. Focus on landscaping? And maybe new garage doors?