We suggest doing a white-washed brick and white or light gray siding. Keep the black shutters. While this is a different style of home, it's the same idea:

ok, since everyone is on you over the box size, I made them a little larger for you. maybe double them and center them under the window. they do look better larger. I also gave you proper Craftsman style numbers. You could choose a diff location. as for the color of that first pic, I gave you some close options for that grayish green hue Choose one of the darker greens for some accent contrast, and maybe a warmer Autumn type color for the door. Or you could do this accent color on the porch like a chair , bench, or even a porch floor or ceiling color. don't forget some ceramic pots in the copper color or better yet, window boxes!

So some simple changes are get a pedastal for the plant to raise the height to desk level or above and get an arc lamp for over the sofa. A collection of attractive large-enough storage boxes or baskets on top of the room divider book case might be cheery. Or some wire sculptures (do you have one there?) Funky animal decor It’s tricky to put a rug under an office chair with wheels, but in your case it might be worth it to do that to warm up/boho-up the vibe in the room, and then put a transparent office mat under the chair so the wheels glide This have any appeal? Fun rug I would get a perpetual calender or a chalk board for the blank side of the room divider bookcase.

I agree w/ tozmo about disliking black and thinking that a creamy color would complement your brick and stone better. Re window boxes, I'm in z5 so they're planted from the end of May until the frost kills them (usually Sep or Oct). One year I decided to fill them with stems of silk mums for autumn, then switch to silk poinsettias right after Thanksgiving. I didn't anticipate the mums being frozen solid in the soil until late April. LOL!!! Fwiw, I now use fresh cut evergreens for my window boxes in the winter and love the look.