Basic Panel: Contrast +15, Shadows +60, Blacks -10, Vibrance +20.
Detail Panel: Texture +40, Clarity +25 (this is the key to making the scales "pop").
HSL Panel:
Saturation: Green +50, Yellow +20, Orange +30.
Luminance: Green +20, Orange +10.
Masking: Add a Radial Gradient over the eye. Inside the mask, Exposure +0.25, Clarity +15, Sharpening +10.