I don’t know if you’ve ever tried to take a photo with your iPhone after the sun has gone down, but it’s a challenge to get a shot like this. You absolutely have to use an HDR app that takes multiple exposures and merges them. If you try to use a regular camera app, you’ll end up with either a nicely exposed sky and a very dark foreground, or a white sky and a properly exposed foreground. Sadly, neither one is like what you were seeing in person.
For this shot, I used TrueHDR. Ideally, you’d set your phone up on a tripod for HDR, especially at this time of day. It’s very important to keep the camera as still as possible so the HDR app can merge the images more cleanly. If you click on the image to view it larger, you’ll notice the the trees in the middle of the image are slightly off, as well as the hill on the right. Luckily, its not too noticeable if you’re just sharing a smaller version with your friends. You may not have even noticed it if I hadn’t pointed it out.
I edited this one with Snapseed. The image straight from TrueHDR was very flat, meaning it needed more contrast and some pop.