Here’s a refined color palette based on your provided colors, keeping the blue intact while enhancing the overall harmony:

json
{
  "palette_name": "Enhanced Harmony",
  "colors": [
    {
      "name": "Light Gray",
      "hex_code": "
          
          #F0F0F0
       "
    },
    {
      "name": "Soft Lavender",
      "hex_code": "
          
          #A7A3D2
       "
    },
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #90C0F0
       "
    },
    {
      "name": "Charcoal Black",
      "hex_code": "
          
          #1A1A1A
       "
    },
    {
      "name": "Dark Gray",
      "hex_code": "
          
          #303030
       "
    }
  ]
}

Palette Description:
This palette retains the soft sky blue to maintain a calming effect while introducing a softer lavender to add warmth and interest. The light gray provides a neutral background, and the charcoal black offers depth, complementing the darker gray for balance.

Would you like any further adjustments or additional colors?