Help improving image quality (Panasonic DMC-GX1)

[PaulST]

Hi,
I've possibly posted this in the wrong forum so can the mods please move it if appropriate.

I’ve just returned from Israel and took a few photos although I’m concerned that the quality of the images isn’t as good as I was hoping. I’m keen to know, do I need to change any settings or am I expecting too much and need to upgrade the camera?
I should note that I don't know a lot about cameras.
The camera is a Panasonic DMC-GX1.
The current settings are as follows:
Photo style: standard (as opposed to monochrome)
Aspect ratio: is now 16:9 (note that my example photo isn’t that)
Picture size: 4576x2576
Quality: (attached a photo because I can't describe it)
Colour space: S RGB (as opposed to adobe rgb)

Here’s a photo of the Sea of Gallilee in Israel. If you zoom in only a little, it becomes fuzzy which I imagine is because the image quality isn’t brilliant.
How can I improve the image quality?


Thanks!