"Design a text-only logo for ‘oh! so natural’ using a classic vintage serif font that harks back to the 1960s advertising style. The brand name should be rendered in mustard yellow with mint green accents, possibly underlining ‘natural’ with a mint green line or incorporating small mint green leaf motifs around the text. Emphasize a shadow or outline effect in teal blue to add depth, making the text pop against a classic ivory background. The overall look should be warm, inviting, and distinctly retro, reflecting the brand’s commitment to natural skincare."