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

Suggested Earthy Green Color:

• Moss Green ( #4A6A4D ) - A rich, muted green that reflects the beauty of nature and adds a grounded, organic feel to the palette. It evokes imagery of moss-covered stones or lush foliage, making it a perfect earthy addition.

Updated Palette with Earthy Green:

 <Rich Earthy Trio with Earthy Green>
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.

Suggested Uses for Adding Earthy Green:

• Branding Elements: Use Earthy Green to evoke feelings of nature and tranquility. It can be a supporting color that pairs beautifully with Medium Walnut and Warm Chestnut, enhancing the overall brand identity.

• Packaging Design: Incorporate Earthy Green for product labels or as a base color for packaging to create an organic, inviting look that reflects the natural ingredients of your skincare line.

• Website Design: Use Earthy Green for buttons or call-to-action areas on your website, ensuring it complements the warm tones while encouraging user interaction.

• Marketing Materials: Design marketing materials that feature Earthy Green in backgrounds or accent graphics, providing a natural touch that aligns with the brand’s focus on earthiness and wellness.

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