Aside from snarky comments about vinyl siding always being a "wrong choice"... I assume you're asking about color. Unless you live in a neighborhood with HOA color police you can do whatever looks good to you. Often you might want an outbuilding to be a different color as you look at it from your house, depending on whether you'd like it to stand out or blend in with whatever's behind it in your field of view.

IMO if natural light is lacking a gray will not make it better as for the window frames why not just do drapes on those windows to hide most of the frame and carry on. Those grids are on the inside of the glass or are they removeable? IMO painting vinyl never works well and when it starts to peel it is not a pretty sight. Get the drapes in a bit of pattern that has whatever you choose for wall color and a bit of off white .Show us a bit of your stayle and the furniture if you want other suggestions for wall color.

celerygirl did a nice mockup. you could also turn it so the doors are at 3 o'clock i'm guessing you'll want a double car? maybe you can get an additional room over the garage too. your house is perfect for the garage add-on that will make it look like it's always been there why don't you have an architect draw up some plans for you? you're going to need them

You have a very beautiful and big house. I really like it. It seems to me that the new garage doors should be beige. This color will be ideally combined with both white windows and brick facade color. I recently also ordered the installation of new garage doors of the easyfixnashville.com company. The guys are professionals; they even helped me find the perfect gate for my garage. It was high time to do this because my old garage doors were not automated, and it was very difficult for me because of this. In winter, it is especially difficult when it is cold to open and close the garage doors manually.