Here is the updated color palette based on your requirements, maintaining the overall theme while incorporating your requested changes:

json
{
  "palette_name": "Updated Presentation Palette",
  "colors": [
    {
      "name": "Sky Blue",
      "hex_code": "
                            
                            #87CEEB
                        "
    },
    {
      "name": "Teal",
      "hex_code": "
                            
                            #008080
                        "
    },
    {
      "name": "Coral",
      "hex_code": "
                            
                            #FF7F50
                        "
    },
    {
      "name": "Copper Red",
      "hex_code": "
                            
                            #CC5500
                        "
    },
    {
      "name": "Mint Green",
      "hex_code": "
                            
                            #50C878
                        "
    },
    {
      "name": "Lavender",
      "hex_code": "
                            
                            #E6E6FA
                        "
    },
    {
      "name": "Gold",
      "hex_code": "
                            
                            #FFD700
                        "
    },
    {
      "name": "Bright Yellow",
      "hex_code": "
                            
                            #BFFF00
                        "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
                            
                            #6A5ACD
                        "
    },
    {
      "name": "Dark Gray",
      "hex_code": "
                            
                            #A9A9A9
                        "
    }
  ]
}

Palette Description:

This updated presentation palette retains a vibrant and professional feel. It includes a mix of cool tones like Sky Blue and Teal, warm notes from Coral and Copper Red, and a refreshing Mint Green. The palette also features classic elements like Gold and Slate Blue while introducing Bright Yellow and Dark Gray for added contrast and versatility.

Would you like to adjust any specific colors further, or is there anything else you need assistance with?