Original image

step 1 of 3
Play with the blending mode and opacity.
Lizard tail add to man. And skin blend onto it.

step 2 of 3

step 3 of 3
Blend: screen/soft. Played with opacity level.
Colour range: select darker parts. Feathered. Than removed.
Gaussian blurred.
Brush out unwanted area with soft brush.
Eagles added.
Shadows added.
Dodged and Burnt.

Final result

