Design a captivating clip art image of an oak tree in a watercolor style with a white background. The oak tree should be majestic and exude strength and wisdom. Focus on its sturdy trunk, spreading branches, and broad, lobed leaves. Use earthy tones and vibrant colors to bring out the tree's natural beauty, including shades of green, brown, and golden hues. Pay attention to the intricate details of the bark and leaves, capturing their texture and unique patterns. Consider adding elements like ac