Masking (Tilt-Shift Blur):
Add Linear Gradient from the top, stop just above the Arc. Inside mask: Sharpness -100, Clarity -50.
Add Linear Gradient from the bottom, stop just below the Arc. Inside mask: Sharpness -100, Clarity -50.
Basic Panel: Vibrance +25, Saturation +10 (miniatures often look more saturated).
Tone Curve: Slight S-curve for contrast. Lift the black point slightly for a "model" look.
Detail Panel: Sharpening +40 (this will only apply to the un-masked, in-focus center area).