Firstly, make sure that the visuals you use in your posters are effective. Also, figure out the ideal place where you feel that your poster will invite maximum attention from the people. It demands some research on your part. Next, stay updated with the latest trends in the field of poster marketing. Be clear and concise with the content, and ensure that your message is clearly explained in your poster. Don't restrict your creativity at any stage. With posters, being a bit patient, staying with the trends, and being crisp with everything will boost the chances of achieving desired results.