Hi definitely remove the x bars on the deck balustrade. Landscape close to the house so it grounds the house. Trees will make it look less bare. Chose some that work for your area, that are evergreen, and are not going to grow really big. With a really plain house - dark colors will make it look better. Dark Grey, or black with a warm tone so it doesn't have a blue undertone in it. Make sure it is a warm grey or black. Use green foliage around it. Paint out the pergola in the dark grey too or white if you want a different look. Fill in the balustrade where the x is removed with plants in front of those areas. Grow a vine up the pergola that is nice.

There was a similar discussion last week, maybe you can get some ideas from it: https://www.houzz.com/discussions/help-for-exterior-cedar-siding-trim-color-dsvw-vd~661559

based on the drawing, the wall where the bed is. HOWEVER, you mentioned that this drawing is not a true depiction of the furniture you will use and the wallpaper. if that is the case, i think the wall paper can work on either wall, it all depends on how busy this wallpaper is and how "plain" the bed is. if you go with a busy wallpaper behind the bed, you may want to keep your bed and bedding on the minimal side so that there is a good visual balance to the overall composition. if you go with snazzier bedroom furniture, then a busy wallpaper may be a bit much and you may want to put it on the other wall or use a textural option to serve as the bed's background rather then another focal point.

There is no common link, no continuity that each dwelling share. i would introduce an element to both structures, borrowed fm the other, so for example the red brick and windows are the most striking design elements in the house, however the rendered garage with a parapet and no visible roof may as well be from another planet, I would brick up the front piers aside the door, with matching red brick, and then I'd install some post and beam rafters that could extend over beyond the garage door, almost like a flat eave, however just beams, no roof, and paint it chacoal, I'd then link a path from th garage to the house, and create the same detail at the porch entry of the home, same beams, colour and materials, so it looks like they belong on the same property. also, perhaps a little scary to consider, i would render the wall in between the door and the first window only, and paint the front door in the matching blue. Windows I'd go charcoal as per th beam structure, and apply a stained timber batten to the flat parapet above the garage, so paint that black, then fix timber battens vertically wh enough spacing to see that black shadowline, it will modernise it, emphasising the elongated design, which is both contemporary and popular, and tie this timber detail into the house with a generous deck. Both timbers will link, over scale th deck, perhaps stagger a step or two, as the garage is over scaled also. remove the fence, and landscape the corner with over scaled shrubbery, a meandering path to help invite ppl between the two structures., the visual disconnection is the fence, but it translates into everything else. if a fence must be, then consider a half height one, or an informal row of sleepers as uprights, to softly define the yard.