Is it permissible to display signs containing pictures of an unveiled girl encouraging reduced speed and pictures of a cemetery with built graves, and what is the ruling on sitting in this office to offer assistance?

Photographs of living beings are permissible as long as they do not show what is unlawful to look at. As for pictures of graves, it is better not to hang them. However, it is not forbidden to sit in a place where there are impermissible pictures, and the madhhab does not prohibit that.