The clarity

I visited this site for interesting news on sigma and tricks,
RytterFalk and this particular link
shows how to make an image "pops" or more 3d. Although Carl mentioned that the PS gives full control actually you can do nearly the same on the LR by reversing the technique.

1. Use the clarity and do a small negative pull on the slider, this will cause the whole image to be less "clear".
2. Select the brush tool and select "clarity" and move the slider to positive then paint the area of the image whereby you want it to "pop".

Good luck!