Ok are we talking architectural designer or interior designer? Architects are more about lines and form and they grumble about the interior designers but that's who they hire to do the color boards. Either way you are the client and it's your house. It may be a great color scheme for the design but if you don't like it change it. Those sample of paint are worth every penny because you need to see more than a little chip. With your asymmetrical design you have room to vary more than the usual field or base color and a contrasting trim. I'd make a tracing of the design and copy a bunch of pages of it to use as a coloring book. (yes use crayolas:-) Another shade from the same shale grey paint chip and a one more accent color would be a good bet. If you are going subtle neutral, make it 3( not 50) shades of grey and play with where you put the darks and lights. Remember sunlight and shadows will create alot of contrast for even a "pale monochrome houses. (the computer rendering doesn't give you that.) You could add a pop a smoky teal, plum or coral if you want color as bold as you design. These would just be accents or trim. If shale grey it a really light silver you could make a monochromatic scheme with blue grays and a navy blue door and trim. The tan/beige in the rendering needs a darker grey to work. I would keep my midtone color on the lower level and a lighter shade on the second level. The top part that pop out could be a bolder accent color withe rest of the upper level almost white. Lot depends on your roof and window frames and whether you want them to blend in or pop out. Try a bunch out on paper or one of the computer programs before choosing any changes.

Thanks for all of the suggestions everyone. Given me many ideas to think about

Mandi, your home is very appealing, it's a good solid mid century home. Personally I would prefer to see the carport at the end of the drive as close to the garage as possible, keeping unimpeded access to your front door. If you don't have room for this I think Siriuskey's suggestions are good, if you can separate the carport and pedestrian traffic to the front porch. Even if it's a separate path parallel with the drive. I'll go with previous suggestions for the garden, in particular a viburnum hedge.

It's just that the carpet doesn't sit nicely with the wall colour. You need some accent colour in there so your chair is fine but I would add or replace some of the cushions on the lounge. The artwork is over your head so bring that down to eye level and I would look for a new colour for the wall as that is the easiest to change. Hopefully you don't live in a too warm climate as the carpet is a warm colour and the toning the wall will add to the warmth. I realise that grey is very popular at present so my other suggestion would be a huge grey mat to cover a much larger part of the existing carpet.