EEG Arduino Shield PCB Optimization

I'm developing an EEG PCB device that functions as an Arduino shield using KiCad. I've completed the schematic diagram, PCB layout, and component selection, but now I need an expert to:

- Verify component values
- Review the overall design
- Improve efficiency

Ideal skills and experience:
- Expertise in PCB design and KiCad
- Strong understanding of EEG circuitry
- Experience with Arduino-compatible shields
- Knowledge in signal integrity and power management