Hate to say it , but if it is a bad image, it is a bad image. Nothing you can do to make it look nice. Just redo the shoot and pay attention to the lighting and what is in the background (porta-potty) during a car shoot is not cool. I see a military sticker on the windshield so am sure there are places on the base or nearby that you can use for better backgrounds. If you throw in that pretty model, we won't dog you as much.
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Shoot well, Joe