Basically, PSD is a coloring. There are many amazing PSDs out there, which is great for people like me who are not good at coloring their stuff. link
I'm sure that a video tutorial is much better than anything এল-মৃত্যু পত্র could write here. Here are some PSDs এল-মৃত্যু পত্র like, all from Deviantart: link link link link link link link link link link