For the Mother's Day greeting card design, imagine a serene ocean scene captured in a minimalist vector style with flat shapes and crisp lines. The focal point is a majestic sperm whale accompanied by two playful calves, gracefully swimming through a stylized, calm sea.

**Whale Details:**

- **Sperm Whale**: Positioned slightly to the left of the card, depicted in a sleek, elongated form. The whale's body is illustrated with smooth, curved lines. The color palette is a blend of deep slate blues and muted grays, with subtle gradient shading to suggest the whale’s immense size and grandeur. The eye is a simple circle, adding a touch of detail without disrupting the overall simplicity.

- **Calves**: Flanking the mother whale, the two calves are smaller, echoing the form and color palette of the larger whale but with a touch more vibrancy to their hues—a mixture of lighter blues and soft aquamarine tones to distinguish their youthful energy. Their shapes are less elongated and more compact, suggesting their playful movement.

**Background Elements:**

- **Ocean Waves**: The ocean is depicted with gently undulating flat shapes, using layered, overlapping bands of different shades of blue—ranging from deep navy to pale azure. The lines are smooth and wave-like, echoing the fluid movement of the water without being overly detailed.

- **Sky and Horizon**: The top of the card transitions from the ocean into a clear, flat sky, using a gradient that moves from a pale pastel pink at the horizon to a soft lavender above, suggesting the gentle light of dawn or dusk. The horizon line is crisp and clean, separating the ocean from the sky with a thin, precise stroke.

**Additional Elements:**

- **Minimal Sea Life**: Incorporate a few abstract, vector-style sea creatures like tiny fish or simple corals. These elements should be discreet and use contrasting colors like warm coral pinks and sunny yellows to subtly add variety and interest without overcrowding the design.

The card’s overall design should reflect an elegant simplicity, balancing clean lines and flat colors to create a tranquil, harmonious scene that celebrates the bond and continuity represented by the whale and calves.

Generated with these themes: Sperm whale with two calves.

Made with ❤️ by AI.