1、使用硫酸纸拓印出人像轮廓
2、眼珠的颜色有层次有变化
https://v.youku.com/v_show/id_XMjUxNTMwMTg3Ng==.html?spm=a2hzp.8253869.0.0
3、眼窝轮廓的刻画
https://v.youku.com/v_show/id_XMjUyNzk2NjY2MA==.html?spm=a2hzp.8253869.0.0
4、额头的明暗
https://v.youku.com/v_show/id_XMjUzMDEzNzUwNA==.html?spm=a2hzp.8253869.0.0
5、鼻子和脸庞的虚实关系处理
https://v.youku.com/v_show/id_XMjUzMTI1OTcxNg==.html?spm=a2hzp.8253869.0.0
6、人脸亮面高光处理
https://v.youku.com/v_show/id_XMjUzNDgxOTMyNA==.html?spm=a2hzp.8253869.0.0
7、耳朵轮廓的刻画
https://v.youku.com/v_show/id_XMjU3MTUxMDE0MA==.html?spm=a2hzp.8253869.0.0
8、衣服颜色的叠加
https://v.youku.com/v_show/id_XMjU3MTg1NjcwOA==.html?spm=a2hzp.8253869.0.0
9、背景完成图
https://v.youku.com/v_show/id_XMjY0ODA1NzI3Ng==.html?spm=a2hzp.8253869.0.0
