Retro Pixel Art Dragon Guarding Castle AI Image Prompt

A retro fantasy pixel art scene in a 256x256 square composition, showing a huge red dragon perched protectively on the tallest central tower of an ancient stone castle. The dragon has a long curled tail wrapped around the tower, large spread batlike wings, a lowered horned head facing left, and a glowing fiery red-orange body with dark maroon shadows and crisp black pixel outlines. The castle is a weathered medieval fortress with multiple towers, crenellated walls, and small dark windows, sitting on top of a steep rocky hill. Surrounding the hill are rolling green and brown mountains partially covered by pale fog and low clouds, creating layered atmospheric depth. The sky is dusky twilight with a lavender and muted purple gradient, a few tiny white stars, and several distant birds as dark pixel silhouettes. Use classic 16-bit inspired sprite art, limited color palette, visible pixel grid, clean silhouette design, dramatic fantasy mood, side view landscape framing, and subtle old-game atmosphere.