To comply with the lights direction we have to make the "top" layer lighter and the "bottom" layer darker.

为了遵守光的方向，我们必须使“顶部”层打火机和“底”层暗。

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Draw a darker circle on top of the previous circle. Add following Layer Styles.

绘制一份关于先前的循环圈最黑暗的。新增以下图层样式。

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I used the darker square from pattern as reference in order to find the right position for this layer.

我用的是暗方块的方式式作为参考，以便找到合适的位置，这一层。

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