女孩在河边认真堆叠彩色石头形象元素

帮我生成图片：flat illustration, cute cartoon little girl with black hair, wearing an olive green baseball cap, olive green t-shirt, khaki shorts, stacking smooth river stones into a small cairn, with a small stream flowing nearby, clean line art, flat color, no gradient, pastel color, fresh and healing style, white background, high detail, commercial illustration material, vector art, soft tones, cute expression, full body visible, ample white space around the character