What is the difference in usage between 风光，景色 and 风景?
I already answered this question here: Is there a difference between 風景 and 風光？

As for 景色:

「景」 in 「景色」 carries the meaning of 'scene/ sight' -- the picture you see in your eyes, as in  「景物」(sight and things), 「景象」(scene; image)

「色」in 「景色」 carries the meaning of 'color/ appearance' as in 「山光水色」(sight of the mountains and appearance of the water = scenery of mountains and river, lake or ocean )


  The term「風光」 generally refers to 'sight/ scene /scenery' (natural or man made)


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  The term 「景色」 generally refers to "sight/ scene /scenery" (natural or man made)


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  The term 「風景」 specifically refers to 'the sight of a landscape or a natural scenery' 


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「西湖風景」,「西湖風光」or「西湖景色」all mean "scenery of the West Lake"