Question one: I would not paint the garage door the siding color. It would keep it the same color. Question two: IDK. Color needs to complement and also must be done in the right percentages. I have seen homes like yours in Aberdeen, NJ with the same brick color and used white as the window trim and it worked Question three: What ever color you use on the sidelites should also be the posts. Question Four: A retractable screen will look fine as long as it is installed cleanly. Question five storm door trim should match the sidelites. THere are internet websites you can use to choose colors. You choose the style of home and add colors to the trim, garage and siding to see if the colors work. The issue is what looks good on the computer is not the same on the home. Every single paint color is made with different percentages of color thus when you paint different colors emerge depending on what color is nearby. Hawthorne yellow is a green yellow on my exterior home whereas in an interior room it has a butter yellow. I painted a home recently a cream wheat color but it is a light yellow on the clapboards. FInd an artist. Find an art student and ask them their opinion. They tend to understand color and percentage of color on any project.

I suggest posting on the Home Decor forum but in the meantime check out the pics in the link below for more visuals. I see nothing wrong with the white garage door and other white trim and don't think I'd do 2 colors on the sidelights. On my monitor the house looks gray......is it gray or tan? Since you have a covered porch, do you need a storm door? Here is a link that might be useful: grarage/trim colors

I think black trim and doors would be very elegant on this house. Or a very dark forest green could work, too.

I like the current color, it’s a classic look and compliments your brick perfectly. I think the bronze or Desert Tan would work well, too (obviously making sure they wouldn’t clash with the colors of your bricks). I don’t like any of the other choices for this stately house. Beautiful home!