Maybe I am missing something. Is the only content of this image supposed to be a 3D effect? Because, 3D or not, it is not a very good image and the purpose of any effect, is to enhance or bring out what one wishes to convey. What is the point or motif of this image? Is it the moss, its character or texture? It looks to me like a failed attempt at shallow depth of field. So one should simply stop down until the the desired effect is realized. On the other hand, if in achieving the desired depth of field, the image still looks bland or ordinary, or fails to convey what one intends, because of its surrounding or other elements, my suggestion is to recognize this and move on. I have deleted hundreds of images where the DOF was not conducive to the overall look of the image.
JMR