Hawkeye

I spotted and photographed this bird in a local willow tree today down by our village lake and I have temporarily named this little guy Hawkeye, but I am unsure exactly what it is. The colouring is mostly accurate, but on the wing area, there was an out of focus leaf or twig much closer to the camera that has given it an apparent yellowish tint on the shoulder. It was very tricky to catch an uninterrupted view through all the twigs and branches. I have managed to narrow it down to either a Brown Goshawk, or maybe a Collared Sparrowhawk. I'm leaning towards the Collared Sparrowhawk for now. Apparently the plumage and colouring on these two birds is remarkably similar, but one is much bigger than the other. This seemed fairly small to my eye, For my fellow Aussie birders, it was maybe a similar size to a rosella - perhaps even slightly smaller. Very hard to tell. Any help with ID much appreciated! Either way, this is one for me to tick off my list of unseen birds as I haven't spotted either of them before.

 

(Now confirmed as a Collared Sparrowhawk - many thanks to all those who chipped in!)

Done