there are way too many colours going on here. Your home is a traditional style and yes the cream and green are traditional colours with the reddish brick however why did you put grey around the windows??also you have red scollops above the grey and it doesn't do the house justice. What colour was there before you painted the grey?? considering grey is a more modern colour I think you were attempting to modernise the externals. in saying that the roof would have been better to paint charcoal the cream in white and then the grey and then the driveway would be done in a grey stain. but if you leave it the way it is and cover the red scolloping above the windows the same grey and the bricks below the windows near the ground grey as well then get the drive way restained to the reddish colour of the bricks on the house and then it would blend more and look inviting.

colorbond will always scratch if not carefully handled - that's why the flat/flashing sections come supplied with plastic protection......colorbond colours are essentially just a quality/proprietary paint application to the zincalume material......the risk is actually more the other way around in regards to corrosion, say if you mix & match steel/gal gutters that have run off from zincalume sheeting, or lower sections of older gal roofing catching run off from zincalume gutters above - that's when you get accelerated rust-out situation..... If you have had everything replaced with the same material, scratches or intact, you should be OK........ BTW any roofing will buckle when walked on - the roofers should know to only walk over where it's supported structurally....possibly the older heavier gear would hold better, because back then they made it thick so it lasted for longer......but then new technology with zincalume enabled thinner and more durable material that was easier to throw around, but equally requires more careful handling when fitting

Just as a tip, those dark colours in your light brick arent' grey, they are a deep purple/brown also known as Burnt Umber. The midtone colour in that brick is also a purple brown in a natural mineral, in artists land that colour is called Indian Red, other similar hues are perylene maroon and piemontite. I'm an artist so very used to seeing different colours and their undertones. Colours that will go with that will be blacks that are actually red or purple based. So NOT monument which is a blue based charcoal. Blacks come in many different tones and it's important to match the undertone to your brick for colour harmony. Blacks which are complementary or blue based will stand out more but may not go as well. Which is why the grey blind seems uninspiring, it's a blue based grey. I'll name some colours in the Taubmans brand. I didn't pick Dulux because it has an abyssmal colour selection atm. Phantom Myst and Fable would both be good blacks to use on your home. Ruby Rose and Redwood and Russet stone would all go with the brick colours. Unless you train your eye to see hues and undertones it's very difficult to spot them which is why a colour consultants have a job. If you're interested learning colour mixing is fascinating there are even hues like red-blues which sounds paradoxical but ultramarine is actually a red based blue' A hack for creating colour palettes super easy. If you have Photoshop you can show it a photo and it will automatically create a perfectly co-ordinated colour palette for you of 6 or so colours which are exact matches to the colours in the photos. Any photo at all, and it will spit out pantone colour codes for you that you can take to paint shop and have them mix up. It picks up some dark, mid and light tones and you can have it create monochromatic, complementary, split coplementary etc palettes that work beautifully.

I agree with Jan -- a lot is personal , and your lifestyles . You say neutral colours , so a wheat type colour for the carpet is a good middle of the road choice , but maybe not practical with kids who like crayons and facepainting and stripping down motorbikes haha . So in that case , maybe a burgundy or mid blue or similar 'solid' colour may suit better ( burgundy may tie in more with the exterior tones ) , but is still sort of neutral , but what about furniture and linen and artwork -- if you have royal blue or fluro green drawers and a brown chair and sunshine yellow duvet/dooner cover , and the room is for someone older than 4 , then burgundy carpet mightn't be the go haha . The existing wall colour works with most things , you can add artwork or posters or sports or academic certificates -- maybe back to front , but I'd sort out everything else ( carpet , furniture , etc ) before deciding on a wall colour , unless sticking to the existing or similar colour .