The castle is imposing. Its walls are a dark grey stone and its turrets are a dark brown. The drawbridge is made of a light brown wood, while the moat is a deep blue. The windows are small and have steel bars. The door is big and made of dark wood that contrasts with the walls. The forest below is lush and a mix of different shades of green. The sky is light blue, with white fluffy clouds. To make the castle look more realistic, use a shade of yellow for the stone walls and a shade of orange for the turrets. Use beige for the wood of the drawbridge and door. Also, use some shades of blue in the moat. Finally, add some shadowing to give the castle a sense of depth.