Why do my photos on LG G6 seem overly compressed? I've just come back from a nice hiking trip where I took lots of photos that looked good on the LG G6 screen. 



But looking at them closely, there is very little detail - they've been heavily smoothed.

Here are those rocks in the midground:



I have the image quality settings at 4:3 (13MP) and this particular image is 4.4MB (original here).

Is this normal? Is there anything I can do about it?

(I'm using Google Photos, but the screenshots and original image above come from exporting directly out of Gallery, to email.)
Yes, it's normal. LG camera software does it.

You can fix it with Google Camera ported to LG G6. It may lack some functions compared to LG camera app.