Here is the revised color palette with slightly darker tones while still retaining the essence of a pool theme:

json
{
  "palette_name": "Dusk Poolside Retreat",
  "colors": [
    {
      "name": "Deep Aqua",
      "hex_code": "
                            
                            #4B9DC3
                        "
    },
    {
      "name": "Ocean Blue",
      "hex_code": "
                            
                            #3A8BB0
                        "
    },
    {
      "name": "Dark Turquoise",
      "hex_code": "
                            
                            #7FB8B8
                        "
    },
    {
      "name": "Vibrant Coral",
      "hex_code": "
                            
                            #FF4040
                        "
    },
    {
      "name": "Bright Lemon Yellow",
      "hex_code": "
                            
                            #FFE135
                        "
    }
  ]
}

This palette features deeper shades of blue and turquoise, creating a more serene and sophisticated atmosphere while keeping the vibrant accents intact for contrast.

Would you like to see any more changes, or do you have a specific project in mind for this palette?