复制底部的模特图层，并将其置于顶部，然后将其设为剪切蒙版。
Duplicate the bottom layer and place it on the top. Then place it in the clipping mask.
现在在水彩图层之上再新建一个图层，然后从下至上从黑色到透明做线性递减绘制，这样基本上整个画布到底部就褪化为黑色了。
Now in a new layer above the watercolor layer, and drawing straight up, make a Linear Gradient going from black to transparency so that afterwards your canvas basically fades to black down the bottom.
点击图层面板底部的添加图层蒙版按钮，并选中画笔工具(B)。
Click on the Add a layer mask button at the bottom of the Layers Panel and select the Brush Tool (b).
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