First thing that hit me when seeing your reply is what a huge mismatch you have between the camera body you have and your lens. There is no way such a general purpose wide zoom range lens (from any manufacturer) can even approach revealing what that body is capable of producing. Your camera is completely wasted with such a lens. I think that if you put a top notch lens on that camera body you would be astonished at the quality it is capable of.
Not only that but the detail it is capable of producing demands not only top quality lenses but also impeccable technique on your part. Buy a high quality macro lens (I would suggest the Nikon one) and use it with the camera on a solid tripod preferably with a cable release or use the self timer. The ideal would be to also use mirror lock up plus low ISO. Hope that helps.
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