develop the raw with dpp. in photoshop: rotation and crop, new level and overlay, lucis art, B&W convertion with channel mixer, clone out some point and a little object on the background, select the background and gaussian blur,selective gaussian blur for the jpg artifact,smart sharpen.
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Interesting subject but I think your choices with levels / curves / contrast haven't quite delivered the potential in this image. This result gives blocks of black, white or grey within which detail might have been expected.