Ran across these two tutorials and found them eye-opening so thought I'd share. The presenter is a master of subtlety and the results can be stunning. The examples are of portraits/people but the principles can be applied to many subjects. I played around with these techniques on a few of my animal images and they made a huge improvement. Definitely worth a look.
Sharpening with surface blur:
https://www.youtube.com/watch?v=FBxyzpp0sLI
Color grading:
https://www.youtube.com/watch?v=PH2zj1sTUak