Is the signature seal of calligraphy works divided into four-foot, six-foot and eight-foot rice paper?

Hello, this actually depends on the size of your handwriting. If the handwriting is large, you need to print a larger seal. If the handwriting is small, you need to use a small seal. For some knowledge about seals, I suggest you find this article to read "Seal Knowledge and Common Problems of Calligraphy Works (Use, Types and Seal Maintenance)", which tells a lot about seals, which may be helpful to you!