不过最近好象都比较忙了, 几乎见不到身影

最主要是创意, 其次才是技术. 如果你有绘画基础的可以用笔画了scan进photoshop再做处理. 一般专业的好象都是这么做的.

but at a professional image processing software package, it's still quite daunting at a first glance.

imagine you'll playing with layer masks while jugglding between the alpha channels and simultaneously trying to figure out how the clipping path works. :)