Build displayed composite with layered Smart Objects using high resolution files following comp layout.
Adjust the lighting direction, fill and soften shadows for all figures to place them within the space.

Use CaptureOne to correct the skin tones and lighting of the two main figures.
Use CaptureOne to bring detail and shape into the vehicle interior.

Adjust color of greens to look natural and lush within limits of CMYK.
Harmonize perspective and lighting overall.