If you used a displacement map then there is a good way to do it, make a copy of the original image and de-saturate it, then do a levels adjustment for the contrast to darken the shadows and lighten the whites in the de-saturated image to make look almost a deep black and white without loosing some of the detail. Then use a Gaussian blur between 3 and 10 pxls, this make sure when you apply the displacement map it dos not look to sharp on the edges and make the image look funny looking, Apply your displacement map starting at around 10 to 20 on the settings for this type of image and this should give you a better result.
Play around with the settings to get you right results your looking for.