I'd agree with adding darker colours to the mix... if reupholstering things is not in the budget just by adding chocolate, charcoal or navy blue to the chair and bedding will help. Add some rougher textures, chunky knits, pin stripes, vintage linen and right on trend velvet.... Adairs have a sale for another couple of days on their linen and other products https://www.adairs.com.au/search/?q=Vintage+washed+linen Accessories to consider are things made of dark marble, timbers, geometric shapes and gold... A bold feature wall could give some mood to the room again in the above colours.

The brush nickel taps are more my style, both colour and shape. I tend to find brass a bit old fashioned. But if that is the look going for some can be lovely

I did get a guy out to give me a quote on cleaning and painting the roof. He said he will have to quote it using scaffolding because of the steep roof. That was a couple of weeks ago, but haven't heard back from him yet. I have seen some bad paint jobs of terracotta tiles so am a bit nervous about getting it painted. I wouldn't mind if my tiles were just slightly darker like yours rather than orange, but I do know that the darker they are, the more they will hold heat and Brisbane is hot.

I don't think you need to worry too much about matching metals and I think black is incredibly versatile in that it can look both modern and classic. It's more things like sidelight profile which date doors. I'd try and go for glass in your sliding door as that already exists.  Here is a glass cavity slider I have which I have either side of a double sided fireplace to close off a living space. So versatile. But probably more modern than look you are going for.