"Create a whimsical and cute coloring page featuring a cozy bedroom scene. In the center of the image, a small, fluffy dog is lying on a bed, writing a letter. The bed has a heart-shaped pillow and a soft blanket. The room is decorated with heart motifs, including on the lamp, drawers, and other items scattered around. On a nearby dresser, there are objects such as a fishbowl, boxes, and clothes, giving the scene a playful and warm vibe. The style should be simple, outlined with clean lines, and designed for coloring, similar to hand-drawn illustrations often found in modern adult coloring books. The overall aesthetic is quirky, charming, and inviting, with lots of small details to color."