Sorry to see no Sydney folk amongst us. Been there a couple of times.
I would recommend getting the bus out to Manley beach then catching the manley Ferry back to downtown so you will have sumptuous views of the harbour, bridge and opera house (weather permitting). The bridge and shore front (which hasn't been covered in condos) is also very scenic
Hotels I am el cheapo usually hostels or friends spare rooms/floors.
but avoid hotels in Kings Cross as like its London's namesake is the red light district/junkieville unless this is what you really what to photograph.
Lonely planet accommodation listSounds like you should be running Stock photography seminars