Here’s a revised earthy color palette with a new shade of brown added, along with some color substitutions:

json
{
  "palette_name": "Earthy Tones Revised",
  "colors": [
    {
      "name": "Washed Grayish Brown",
      "hex_code": "
                            
                            #A89F91
                        "
    },
    {
      "name": "Chestnut Brown",
      "hex_code": "
                            
                            #7B4B3A
                        "
    },
    {
      "name": "Olive Green",
      "hex_code": "
                            
                            #7E7B4E
                        "
    },
    {
      "name": "Terracotta",
      "hex_code": "
                            
                            #C76A51
                        "
    },
    {
      "name": "Sage Green",
      "hex_code": "
                            
                            #A8BFA0
                        "
    }
  ]
}

In this updated palette, “Chestnut Brown” adds richness, while “Terracotta” brings warmth, and “Sage Green” provides a softer contrast.

Would you like any further adjustments or additional colors?