The design features a whimsical and charming aesthetic centered around a mermaid theme. The main element of the design is the phrase "Mermaid at heart," which is presented in a playful and stylized font. The word "Mermaid" is written in a large, teal-colored font, while "at heart" is written in a smaller, warm orange hue. The font has a hand-drawn quality, adding to the overall charm of the design. The design also includes a small, stylized illustration of a mermaid's tail, rendered in a soft teal color. The tail is positioned behind the text, adding a touch of visual interest and reinforcing the mermaid theme. The background of the design is a subtle, textured gray, which helps the colors of the text and illustration stand out without distracting from the main elements. The overall effect is a cheerful and inviting design that would be well-suited for a variety of applications, such as a t-shirt design, a greeting card, or a home decor item.