Here you can see the usual settings I use for different default photoshop brushes. Usually I use the leaf brush (noticeable as Ma'am fae said
Here are some of the brushes I use.

Shape Dynamics Settings

Scattering Settings

Other Dynamics Settings

Most of these settings were experiments so I suggest you do the same. Smudging would look good if you make use of a small size brush (usually below 30px or 40px) and then sharpen it or maybe make use of Topaz DeNoise then Topaz Sharpen in the Topaz Vivacity Filter.
Enjoy