Well done. At first look I thought it was another over-sharpened image but there isn't any noise in the shadows so this is a natural look of the texture created by light and shadow. Your whites don't look white enough so maybe a little curves would help? Not too much so that you blow out the flower or plug up the darks but just a little to brighten up the flower just a tad.
Another brilliant composition worthy of a top prize if not the blue ribbon. richly detailed with unbelievable impact, this is clearly an outstanding effort on the part of the author. Perfect juxtaposition of rust and paint, it is simply perfect - can't say enough about the raw beauty here. A top notch effort on the part of the author. Well done.