I took this pic last night and I have no idea what to do with it.
Does it need Post Processing? If so what does it need?
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Post production is a tool in the toolkit of creating the image you want to create
There is no anwser to whether an image needs post production
PP generally falls into two parts
'correction'
Where for example you might fiddle with the WB to create a natural look
'improvement'
Where you might fiddle with the image to enhance it
like smoothing skin, lengthening legs, removing wires from a landscape or in the example that you posted i might consider touching out the marks on the back of the glass
People can argue about the ethics of improvement no end of course - I make no comment
But fundamentally its all about creating your artistic vision or fullfilling a client brief - that may or may not require post productionS