"Another art?" snorted Sir Edward Carson at a remark by Oscar Wilde. But art, as someone once said, is art if you can get away with it.
And certainly photoretouching is an "art". That is, it is not a (ptui) "mechanical exercise" as Leonardo Da Vinci called sculpture. There was no button to press that said "Remove Glare." Nope, correcting this photograph was a painstaking process which involved considerable - ah - "artistry". It was, like a doctor's prescription, a combination of ingredients.