@jactheshe, it would be very hard to imagine. Even digital photos of the colours together can look so different. And depending on how your house is situated & how the light plays on it, that changes things again. I was looking at a picture online of a house using woodland grey with colorbond dune. The dune colour looked completely different to the colour card on the charts. If you have some large lightweight boards around, I suggest painting them out with colours you're considering. Or getting a large sheet of foam core from office supplies or sign companies and using that. It would be light enough to attach temporarily on the facade & give a better idea of which colour works. That way the angle how the light hits the colour is accurate.

I would do posts & gutters in the charcoal (darkest one) & fascia in a lighter tone grey to match the roof. The posts & gutter would disappear & brick work would become the feature along with the roof

Cream always looks good with green, maintain the same green for windows & door. Having said that you can choose any colour by repainting the gutters & fascia etc. Get lots of colour swatches & hold them up to the roof (from a distance) to see what looks best to you. Then get some sample pots & paint so you get the proper effect of the end result. Look around at other painted homes & magazines etc, to get an idea of what you really like.

Personally I would go a lighter grey than monument and leave the posts and garage a light colour to contrast given the grey driveway. Wallaby or basalt maybe.