He was suggesting you make the ark lighter. It is an excellent photo. The problem is thst even if you do notice the ark (which is dofficult because it is similar color and lighting to the rest) it can be difficult to tell what is it because it is so small in the frame. Great framing and background. Try getting really close with a slightly wider angle or macro. This shot has excellent framing though just lighten up the ark in photoshop. Hope that helped and wasnt too much
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