Ciao! Not a bad shot. Photos often have to be fixed up in post. But to get the best pic to work with, enable ProRaw. This will give you max detail. Also, adjust photographic styles for your desired tone and color (this will obviously depend on what look you are going for). Use the camera control feature to focus manually and adjust your exposure.
Remember, the settings on any camera (iPhone included) will depend entirely on the environment in which you are shooting. This includes everything from sunny/cloudy, location of the light source (above, behind, in front), time of day, and even if water is present (which can reflect light and make you adjust the settings), Haze in the sky can also change the way you adjust. When dealing with exposure, it will ultimately come down to how you want the photo to look and, again, the location of the light source
I hope this helps. And remember, be artistic with it. You may surprise yourself.