Your colours will look quite good. Don't forget landscaping will make a massive difference so have a look at that as well.

How about a more contemporary wire rail system as shown below. Also a lovely green grey upstairs may work. The one below is Taubman's battle green full strength - computer colour of it is not accurate.

Your new home looks fabulous! Congratulations from the Team at North! I am a visual person so I hope you don't mind me adding some photos to help explain colours. Your home has more yellow brick then red like these homes. However the dark grey, light grey and white framing works well with the brick creating a modern clean look. Darker grey for roof, light grey timber/cladding on top level and light grey down stairs around the smaller square windows. You could add a window frame, to frame the windows in light grey/white around the yellow windows or just leave them as they are. Painting aluminum is not recommend unless you get the professionals in. If you wanted to use panels instead of timber have a look at James Hardie cladding - 13 11 03 is the contact number - They have a fabulous products that give you cladding with a paint finish that will outlast any timber you put on your home and is low maintenance. Need to check with the local council as to what roof colours are aloud some don't allow to dark because of cooling costs. Its suggested you pick 3 colours to keep it unified. Its a personal preference what colours you like? Below the white and blue grey looks amazing! Please let us know what you choose. A project is always exciting.

Your brick is very dark, have you decided on your mortar colour? I would consider matching your cladding colour to your mortar colour if you are using a light coloured mortar. So much depends on the design and style of your home. I would probably avoid matching the brick colour as you will need a good contrast, so don't go with Monument or Domino! It is impossible to tell without knowing what your house looks like. Have you considered engaging a colour consultant as it is a big decision and there are over 4000 Dulux colours available. Best of luck Dr Retro of Dr Retro House Calls and Dr Retro Virtual Visits