Here’s a simple and structured way of first dividing up the image into a closely-fitting ‘jigsaw’ and then separately and easily applying adjustments to each area.
Extra tip: You can create overlapping selections, then use ‘Intersect’ or ‘Subtract’ to create proper jigsaw pieces so each pixel is covered only by one final selection.
For related videos, see here: http://changingminds.org/disciplines/photography/affinity_photo/youtube_videos/732_jigsaw_editing_method.htm#see
There are now online pages for InAffinity here: https://changingminds.org/disciplines/photography/affinity_photo/affinity_photo.htm
Free resources, including macros, palettes, etc. are here:
If you are a beginner, start here:
There is a full, cross-referenced index for every video here: https://changingminds.org/disciplines/photography/affinity_photo/inaffinity_video_index.htm
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The web page for this video is here: http://changingminds.org/disciplines/photography/affinity_photo/youtube_videos/732_jigsaw_editing_method.htm