Lovely shots! I like them according to the order in which you posted them: #1 has a quite distracting background, #2 is much better, #3 is beautiful and #4 is the winner.

Beautiful flower shots!
I like the DOF but perhaps the first three could be a bit shallower? It could help reduce the clutter in the background...
I think Kings Park must be the most photographed place in these forums...
