In addition to what the above two users commented [in regards to pictures], you should follow the following format:
- Clearly show the item for sale
- Include a handwritten note containing a date stamp and your forum user name. [1]Including the hash of the latest Bitcoin block and its associated block height in the note will also verify that at that moment in time the goods are in the sellers posession
- If there is hashrate related information screenshots are nice to include
Example: https://i.imgur.com/Nn8UtGsm.jpg
I understand that with some ranks pictures do not show up. Post the link anyways as a higher rank member can quote you and the photos will then be displayed.