nice capture! I'm just thinking here though, have you noticed with the spark that chromatic abbreviation allot? just around the sun set colours when it the smooth transition of the colours is a little blocky?. I got a similar effect when trying to do a long exposure and had a light cast, it looked like the sensor wasn't sure what to do. I just bought the spark to replace my phantom 3S and didn't get that with my old drone. Hopefully its not a problem relating to image compression and the no raw issue with spark.