Your house is going to blend in very well with it's surrounds once the timber has silvered off, if you choose to use colours like Colorbond Woodland Grey, Dulux "Pavings Stone" (left hand side of colour swatch in the image far below) and/or Dulux "Grey Mountain". Other darker colours that will work well in this setting include Dulux "Cambridge Hall" and Dulux "Nomadji" (mentioned before). These greys don't necessarily blend in with the fresh timber but look fantastic as the timber ages and the building is seen as a whole (see image far below). "Paving Stone" is a versatile medium, warm grey that looks really good as a render. It also works well as a neutral internal wall colour in rooms with lots of natural light. In the following image, Dulux "Grey Mountain" was used near the timber work and "Woodland Grey" on the garage walls to help the garage door become less noticeable. Remember that colours generally appear lighter than the sample when applied to external walls and darker when applied to internal walls.

I suggest the colour of your gutters & window frames (if they are the same colour?) i.e. a darker colour. Light colours, especially Surfmist, tend to stand out and block the depth of view. The viewer will look "at" it. Dark colours recede and you tend to look "into" them and they are more inviting, They also add warmth. Keep in mind any colour significantly different from the render colour will stand out and become a dominant feature of the total house appearance. Hence why custom doors are gaining popularity as the styles can be one colour and the infill panels can be a myriad of colours and textures. Having trouble choosing from the standard Colorbond range of colours? Consider getting a Dulux powdercoated colour. They cost a fraction more but deliver a whole range of colours. They also offer better fade & corrosion protection especially if near coastal areas. You can also get the tracks on the inside powdercoated in black which looks neat. Custom spray painted colours or a vinyl/rubber "wrap" similar to the trend used on changing the colours of cars is emerging as an alternative. Don't get an embossed pattern on the panels that is either rectangles or squares. They are dated designs. Also, a smooth finish will show up an imperfection in the metal. The Cosmopolitan or Wide-Line styles (www.asapgaragedoors.com.au) suit rendered house finishes. Solid wood doors are a lot of upkeep (to stop fading and weathering if not sealed properly), are very heavy, and require a stronger motor. Colorbond colors Caoba and Cedar wood-look metal doors like all colours fade over time and can look daggy especially the Cedar. Custom doors are expensive. Be aware that many of the polycarbonate infill door panels (see-through & opaque) can get condensation in the hollow inners which eventually becomes mouldy. Sectional (panel) doors have many moving parts which need to be regularly serviced i.e annually.

It's an open book really. Since you are changing the gutterings and the windows are plain aluminium you can choose any colour your please. It'd personally go with a classic neutral tone, not white, which can look very dated very quickly and shows up every bit of dirt splashed on the side of the house and blown in on dust.

Starting point of works may be the garage door but the starting point for the look has to be the roof. Do you like the green roof or would you like to change it’s colour? Second. When you arrive home what do you like and dislike. For me, and it is personal, I find a brighter entry more welcoming. So I look at your house and feel more welcome by the cream garage doors than the front door. Which seems hidden but should be the welcoming feature. Hey but we mostly drive these days so the garage needs to be welcoming too. Pottsy’s image above , which I love, has a lot of cream to brighten up the dark bricks. I’m not sure if you have enough timber to paint around your windows to get the same effect. I’d maybe look at rendering the porch and matching the garage to it. Painting the outside of the windows to match. If you don’t want to render Porch I would do a white front door. And create a path to the street. So should you paint or replace the garage door. Firstly I don’t think the trim works as you don’t have arches anywhere else, If this can be removed and doors function then paint. And we can’t forget the role plants play.