Pixel Art Dragon on Castle

A retro-fantasy pixel art scene, rendered in a 256x256 square, depicts a colossal red dragon guarding the highest central tower of an ancient stone castle. The dragon has a long, curled tail coiled around the tower, enormous bat-like wings spread, its head, with long horns, droops and faces to the left, its body a bright red-orange with deep chestnut shadows and sharp black pixel outlines. The castle, a weathered medieval fortress with multiple towers, crenellated walls, and narrow, dark windows, sits atop a steep, rocky hill. Surrounding the hill are rolling green and brown mountains, partially shrouded in light mist and low clouds, creating a layered atmospheric depth. The sky is dusky, displaying a gradient of pale purple and soft violet, dotted with a few tiny white stars, and in the distance, several birds appear as black pixel silhouettes. It features classic 16-bit game-style sprites, a limited color palette, a visible pixel grid, a clean silhouette design, a dramatic fantasy atmosphere, side-view landscape composition, and a subtle retro game feel.