图中光滑的石头利用形状、尺寸和颜色的相似取得连贯性。
This image of smooth stones USES similarity in shape, size and colors to provide coherence.
对于判断一个物体的形状以及它是粗糙的还是光滑的，大象有自己的方式。
Elphants have their own way to tell the shape of an object and whether it is rough or smooth.
为了创建阴影，你可以新建一个图层，摆放它到大的形状的下方，然后用画笔工具画一个光滑的阴影直到你满意为止。
To create this shadow i recommend you to create a new layer, place it under the big shape, and then with Brush tool start drawing very smoothly until you are happy with the result.
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