The content of posters, billboards and hoardings can display general information like family planning, social welfare schemes, etc. but they cannot display the achievements of political parties, photos of politicians and party symbols during campaigning.(( Chapter 6, Manual on Model Code of Conduct, available at https://eci.gov.in/files/file/9375-manual-on-model-code-of-conduct/))
No political party or candidate can use your land, building or compound wall without your permission to erect billboards, hoardings, flag-staff, notices etc, otherwise it would amount to defacement of your property.
If this happens to you, please complain to your nearest District Electoral Office.
For example, if the ruling party puts up a hoarding on the highway with pictures of the members of their political party, then this violates the Model Code of Conduct.