It is good netiquette to keep your signature to four lines or fewer.
And many news posters, such as some versions of inews(1), will not
post an article that has a signature with more than four lines in
it.  So, put large large pictures, your philosophy of life , etc. in
your finger files or in your Web pages and point people to those in
your signature.

For signatures it's a good idea to keep the width less than 75
characters so that if your signature is included in a followup
preceded by an attribution character (like `> '), each line will
still be on one line.