找张天空的图片。

Make it darker and contrasting, using Image - Adjustments -Curves (ctrl+m)
将图片对比度调高,并将图片调暗(点击图像-调整-曲线ctrl+m).

Cut it out along the eye's line with Polygonal Lasso Tool.
使用多边形套索工具沿着眼角线条将云彩选择并裁剪。

Change the layer's type on Multiply. Take a ready brush now, imitating the marble veins and cover the entire picture with it. Cut the eye's orifice.
层类型设置为叠加。选择一款现成笔刷,模仿大理石纹理将图片覆盖,并剪切掉眼睛所在的部分,如下:

Change the layer's type on Soft Light. Take the next instrument: Brush Tool and picture with it many points of different sizes.
层类型更改为柔和光。新建层,使用笔刷工具绘制大小不同的一些点点,作为 星星。
