The biggest challenge in Photoshop is to be able to "adjust" images
WITHOUT it becoming apparent it's been overly toyed with....
not easy for me, but fun nonetheless:
The original was shot with my old...lower quality Lumix...instead of the new Canon 60D
which is the shnitzel.
a. isolate the rex
b. reduce contrast & brightness in the original background
c. use filter/render/lighting effects to add diagonal light
d. darken grass in original