I lived in Perth for 5 years and traveled the entire country. Your beautiful photos bring back many good memeories. I now have the Canon Rebel XT and wish I had had it back when I lived there in '95-'00! Very vibrant shots!
I agree with gaurawa, concerning the saturation here. It takes away some of the deatail in the blades of grass. What I do like about that issue, however, is that much like in your photo "my country", the over saturation adds a painting sort of feel to the image. So IMO it depends on what your aim is. I also have a feeling that this shot would make an amazing square crop, if some of the top were chopped off. You sure do seem to live in a beautiful country. I seriously hope to be able to take some photos in Australia some day as well!
the colors ( though a bit oversatured) are nice. the photo does lack clarity and details. Its noisy and smudged. Can you post the exif ? I feel it has to do with camera shake or high iso.
the center divide doesn't work for me. the top sky doesn't offer much. you would be better off with croppoing the top part just above the dense clouds...
B-E-A-UTIFUL! Love your eye for the terrain and features.
Again, I get the idea that it's been sharpened too much, maybe oversaturated, it just pings on my eyes. Mind you, I have to close one eye and squint the other when walking into sunlight.