Well photos 1 and 4 are the best. I like the sunset/sunrise, but if you get it printed, it may come out waaaay too dark. There isn't a lot of detail in the waves to begin with. If you have it printed, the printery might print all the dark parts completely black, and that won't look good.
If I were you, I'd go to the beach on 2 or 3 consecutive nights and take some more photos of a great sunset. It's best after a rain or when there are clouds right above Mt Keira. Nice sunset photos are very safe.
I went to North Beach (do you live near there?) and took some photos in front of Stuart Park. There's a guy who takes photos there somewhat regularly, and he could even give you advice.
Here are 3 photos I took just yesterday.
One is facing Mt. Keira, and two are facing the ocean near Stuart park. I like the 1st and 2nd photo best because the 3rd looks particular imbalanced due to the trees, but it's a different perspective of the same thing and might give you ideas.