Here is a revised 11-color palette that maintains a similar darkness level to your original colors ( #48818d , #664fa3 , and #a64d79 ) while ensuring harmony:

json
{
  "palette_name": "Balanced Harmony",
  "colors": [
    {
      "name": "Teal",
      "hex_code": "
                            
                            #48818d
                        "
    },
    {
      "name": "Deep Violet",
      "hex_code": "
                            
                            #664fa3
                        "
    },
    {
      "name": "Berry Pink",
      "hex_code": "
                            
                            #a64d79
                        "
    },
    {
      "name": "Dark Aqua",
      "hex_code": "
                            
                            #007e7a
                        "
    },
    {
      "name": "Plum",
      "hex_code": "
                            
                            #7d4b8a
                        "
    },
    {
      "name": "Moss Green",
      "hex_code": "
                            
                            #4a7c4d
                        "
    },
    {
      "name": "Rust",
      "hex_code": "
                            
                            #b45c3e
                        "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
                            
                            #6a7f9c
                        "
    },
    {
      "name": "Maroon",
      "hex_code": "
                            
                            #7f2c2a
                        "
    },
    {
      "name": "Teal Blue",
      "hex_code": "
                            
                            #2e4c4f
                        "
    },
    {
      "name": "Dusty Rose",
      "hex_code": "
                            
                            #b78b9a
                        "
    }
  ]
}

This palette keeps the darkness levels similar across the colors while maintaining harmony with your specified base colors. Would you like to explore how to use this palette in design projects, or is there anything else I can assist you with?