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These pictures are clicked in the evening, so there was no adequate light. So phone didn't focus properly.
However, if there is adequate light, pictures will be properly focussed and the colours will be accurate.
Check these settings.
In Camera Settings, check if 'Volume buttons function' is selected to Shutter.
Then go to Setings> Sound and vibration> Audio settings> Headphone remote button and select it to 'Control volume level.
Reply back if this worked.