Topaz Studio 2 has a wealth of resources on how to use over at YouTube. Among the best of them is David Kelly, so I have formulated his Toolbox Painting technique into a TS2 Look or Preset. Here is a CC0 photo I digitally painted the David Kelly way.
Link to David Kelly’s YouTube Channel https://www.youtube.com/channel/UCEcP2Oec0caHz23aKGGOayw
And here a link to the shared Topaz Studio custom presets