I think what everyone has said about the garden is what would make a differance. At the moment with no plants at all it looks hot, uninviting and a bit "rental". You can tell the rental houses around here by the lack of garden. Something to give a bit of shade and break up the square starkness would be great. Get an advanced tree of perhaps something weeping- cerry or ghoast gum or maple. (I don't know what will grow in Sydney. Is Frangepany to cleche?)
Maybe a pic from a differant angle of the spa would be better, because it does look a bit weird with the loo in the first photo you see.
Thats my 2 cents.
Good luck.
Have fun with bub. Best thing in the world.