A whimsical Valentine-themed watercolor illustration featuring three original cartoon characters standing close together in a friendly pose.

Character 1: A cheerful, black-and-white cartoon mouse-inspired character with round ears, wearing red shorts and smiling warmly.
Character 2: A playful, golden-brown cartoon puppy with floppy ears and a happy expression, tongue slightly out.
Character 3: A sweet, bow-wearing female mouse-inspired character with soft lashes and a pink bow, wearing a pink outfit.

The characters are surrounded by floating red and pink hearts, soft paint splatter textures, and a romantic Valentine color palette.

Style is hand-painted watercolor, slightly sketchy outlines, light splatter effects, cozy and nostalgic, not based on any copyrighted characters.

Centered composition, transparent background, high resolution, perfect for a Valentine’s Day sweatshirt design.