I don't like the bright red with the rusty coloured bricks. If you want a good contrast, blue is the way to go instead of the red. I like the dark gray on the stone and the garage door. Yellow flowers will look better with the brick than red.
If you dislike the larger area of brick between the upstairs windows and the stone, add a 6 foot high horizontal band of wood. It's a classic with that style of house. And instead of red or blue on the left, use wood too. You may want a darker stain than I have shown.
German schmear is absolutely not the right look for this brick. This house is not cottagey or old-country. Use a solid paint/stain if you must but I like the rust brick colour. It's authentic with your house.
Q