Here’s an elegant upscale color palette inspired by the RGB value (0, 155, 48), incorporating the requested qualities of muted, rich, velvety, sleek, deep, subtle, lustrous, and refined:

json
{
  "palette_name": "Elegant Upscale Hues",
  "colors": [
    {
      "name": "Muted Emerald",
      "hex_code": "
                            
                            #007A33
                        "
    },
    {
      "name": "Rich Velvet Burgundy",
      "hex_code": "
                            
                            #6A1B2A
                        "
    },
    {
      "name": "Deep Sapphire",
      "hex_code": "
                            
                            #0D3B66
                        "
    },
    {
      "name": "Sleek Charcoal",
      "hex_code": "
                            
                            #4B4B4D
                        "
    },
    {
      "name": "Subtle Cream",
      "hex_code": "
                            
                            #F3E5AB
                        "
    },
    {
      "name": "Lustrous Antique Gold",
      "hex_code": "
                            
                            #D4AF37
                        "
    },
    {
      "name": "Refined Slate Blue",
      "hex_code": "
                            
                            #5B8EBE
                        "
    }
  ]
}

This palette features a muted emerald for sophistication, complemented by the rich velvet burgundy and deep sapphire for a luxurious touch. The sleek charcoal adds depth, while the subtle cream balances the intensity. The lustrous antique gold adds an opulent finish, and the refined slate blue provides a contemporary edge—perfect for an elegant upscale commercial poster.

Would you like advice on how to incorporate these colors into your design, or do you have any other questions?