Interesting image and it looks to me as if it would be hard to shoot. Its distributed architecture means it lacks a specific focal point, so I can understand this fill-the-frame approach to composition. I think you have cropped it a little to tightly on the right but the colours of your great subject carry your image.
Wow, I like this shot! What type of flower is that?
The Bottle Brush Plant
Bottlebrush (Callistemon) is a genus with 34 species of shrubs in the family Myrtaceae. The majority of Callistemon species are endemic to Australia; four species are also found in New Caledonia. They are commonly referred to as bottlebrushes because of their cylindrical, brush like flowers resembling a traditional bottle brush. They are found in the more temperate regions of Australia, mostly along the east coast and south-west, and typically favour moist conditions so when planted in gardens thrive on regular watering. However, at least some of the species are drought-resistant.