Start by posting pics of your home. We can't see it with just a general description of colors. Context makes a difference.

Nice house and yard. Consider choosing a dark bold brown for the fascia/soffit (and, perhaps, around your bold red door) but leave all the window trim white. A lighter brown for the siding you're adding would work well. https://www.pellabranch.com/blog/global-blogs/black-window-frames/ If the additional work to be done is changing out the windows, replace the large ?fixed? window with a pair that open and consider choosing black frames. You could then consider choosing a dark bold brown for window trim as well.

On your house, I would leave the roof, paint all the trim white (get rid of all the tan/beige, since it doesnt go well with the house). The maroon shutters also dont go well on your house. I do like shutters on the house, but, maybe use your black on them. Happy to hear you are redoing the landscaping. Those shrubberies are not only too close to your house, they are not really all that attractive either. Everything is linear on the front of your house, try to get some curved flower beds, etc, when you do your landscaping.

The existing dark bronze color of the siding is already a color often recommended for combining with red brick. Note that what you have already leans ever so slightly green (or so it looks on my computer) but in a very muted way so there is some contrast between brick and siding (green and red opposite on color wheel), but not so much to call attention to itself. I like it!!! However I think siding color should be considered in relation to roof color - since metal roof colors are so limited. What are you thinking for that? Perhaps a similar bronze or greige for the roof....Ive seen some which are more metallic in appearance vs. flat color. And then siding color simply becomes something that is different from roof color but closely related (ie darker, lighter, more grayed, or less grayed). I agree with the above posters that it is a beautiful house in a beautiful setting and it is that deck that could use some attention. Use deck structure (if sound) but maybe replace wood handrail with wire or glass as suggested above - the idea is to lessen the obstruction to the view.