Do you remember what time it was when you took the photo? Was it supposed to be dark instead of looking like sunset? Least you can admire the beautiful sky colours for longer :D
"So this was shot at 21:22:14 13 August 2016, so about one month after the longest day and this is shorty after sunset. The sky would still be quite light for 2 hours and I was not even that far up north"
I am quoting a similar question here:
"So this was shot at 21:22:14 13 August 2016, so about one month after the longest day and this is shorty after sunset. The sky would still be quite light for 2 hours and I was not even that far up north"