I'd say it's dust Jakob, you need to clean the sensor.
First try a Rocket Blower or if this doesn't help you may need a sensor brush.
You've captured a very nice scene, lovely rich colours, very nice indeed.
There seems to be a lot of jpg compression though.
Try saving it with a higher quality setting, as you've saved it to around 87k, you can go up to 200k, this will help a lot with the artifacts.
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