To introduce an earthy blue into your palette, I suggest using a shade that complements the existing warm browns, pinks, and greens while adding a calming and serene element. Here’s a suitable earthy blue option:

Suggested Earthy Blue Color:

• Slate Blue ( #4A6A8D ) - A muted, soft blue with gray undertones that evokes a sense of tranquility and depth, reminiscent of stormy skies or serene waters, perfectly blending with the earthy tones of the palette.

Updated Palette with Earthy Blue:

 <Rich Earthy Trio with Earthy Blue>
1. Medium Walnut - 
                            
                            #7D4F3A
                         - A warm, medium brown that adds depth and richness, serving as a grounding element in the palette.
2. Warm Chestnut - 
                            
                            #8B5A29
                         - A medium, warm brown that enhances the earthy feel, beautifully balancing the vibrant colors.
3. Golden Honey - 
                            
                            #C68A3C
                         - A golden-brown that introduces brightness and warmth, complementing the earth tones nicely.
4. Earthy Pink - 
                            
                            #D1A6A1
                         - A warm, muted pink that adds a gentle touch, harmonizing beautifully with the browns and creating a soft contrast.
5. Earthy Green - 
                            
                            #4A6A4D
                         - A muted, rich green that adds a natural element, enhancing the overall earthy aesthetic.
6. Earthy Blue - 
                            
                            #4A6A8D
                         - A soft, muted blue that introduces a calming presence, providing balance and tranquility within the palette.

Suggested Uses for Adding Earthy Blue:

• Branding Elements: Use Earthy Blue as an accent color to evoke feelings of calmness and reliability. It can complement the warm browns and pinks, creating a harmonious and inviting brand identity.

• Packaging Design: Incorporate Earthy Blue for product labels or decorative elements on packaging to create a serene and cohesive look that reflects the natural ethos of your skincare line.

• Website Design: Use Earthy Blue for headings or background sections of your website, ensuring it complements the warm tones while enhancing the overall user experience.

• Marketing Materials: Design marketing materials that feature Earthy Blue in graphics or backgrounds, providing a tranquil touch that aligns with the theme of natural beauty and wellness.

Would you like to see further combinations with this earthy blue, or do you have other colors or themes in mind for your skincare brand?