Generally, we don't post pictures of Muhammad here unless it serves an important journalistic purpose (e.g. showing people the cartoons that Muslims are willing to kill over). The following video makes an important point.
It's ironic that the primary reason Muslims forbid images of Muhammad is that such images may lead people to worship Muhammad. The reason this is ironic is that Islam is an utterly Muhammad-centered religion. Many Qur'anic revelations seem to have no purpose other than satisfying Muhammad's desires. Thus, while Muslims go to great lengths to avoid giving Muhammad honors that only God deserves, by assenting to the Qur'an, they have already deified Muhammad.