简约3D渲染成年人物站立托腮思考灰色背景红色问号插

minimalist 3D render illustration, main colors red, white, and gray, a simple 3D character without facial features, adult, hand on chin, minimal clothing, a large red question mark on the right, both placed on a gray hemispherical platform, strong spatial sense, pure white background, conveying a sense of thought and inquiry