Editing tutorial: learning to blend a foreground image with a night sky shot in affinity photo

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I hit the YouTube rabbit hole the other day. The weather was lousy and I was going through my portable hard drive trying to tidy up folders and delete duplicates. I found these that I had forgotten to process properly. 

An opportunity then to practise doing sky replacement in affinity photo. 

This is my latest effort - Wembury Mill on the south Devon coast, just to the east of Plymouth Sound. 

I took the foreground image just after nightfall. I cant remember the settings - sorry! I forgot to write them down in my little notebook. I did briefly paint the mill with my head torch beam though. I then returned to capture the milky way galactic core just after it started appearing around 0330 ish. That I tracked. ISO 800, 35" x 20 or so. No calibration frames. 

Not my best shot but not bad - I rushed things on the night.

However, it was good practice for trying to get to grips with Affinity Photo

The sky shots were stacked in Sequator first. 

The Milky Way above Wembury beach, south Devon 

My last photos that I did of the area were these: 

Somehow I managed to get a funny red line between sky and far cliff line - absolutely no idea why - but it was a post processing mistake. I suspect I applied a mask and then did some painting selection brush work which didn't quite work out properly 

Milky Way above the Great Mewstone, off Wembury Point, south Devon

Taken from a slightly different position on the beach from the one above. 

Below are the videos I used to help me work out how to do sky replacement.