Add a layer mask to this layer as shown below, this will create a better lighting contrast for the hand and make this overall image look better.

按照下面的样子，添加一个图层蒙版，这样可以给整个画面增加整体光的对比度，画面看起来会更好一些。

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Add layer mask and paint some parts of the line with black.

添加图层蒙版和油漆的部分用黑线。

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Group all the shapes used to compose the robot and Add a Layer Mask, as previously done, to obtain the following result.

把这些形状归成一组，组成机器人，并添加一个图层蒙版，以前也做过，得到以下结果。

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