If you just do the head portrait and signature documents, a Mito Xiu Xiu is enough, even more suitable for you than photoshop. There are many ready-made materials in it, which are very nice. All you need to do is import these materials and then add the materials he gave you. If you want a dynamic signature file, Mito Xiu Xiu can also do it, using self-made flash pictures, but if you use it on Baidu, the number of frames, that is to say, the dynamic time of this picture can't be too long. If there are too many frames, uploading to Baidu will not move. He only keeps the first frame of the image. In short, the first moment you download Meitu Xiu Xiu, you will get these two things, an avatar and a signature. It's a stupid software, as simple as death. If you want to be more professional, you can download photoshop again, but it is not easy to get started.

Well, I'm only responsible for answering the part you asked. There are many methods of ps. It is said that Mito Xiu Xiu doesn't need a tutorial. What ps looks like depends on your preference. There is nothing to teach. At best, I just tell you the software.