Hey Ellie! If it is a circus, maybe make your poster a bit detailed or colorful? Add a frame to it, for example:http://images.all-free-download.com/images/graphicthumb/vintage_style_circus_poster_design_vector_573303.jpg
Thanks Anastasija! You're right about it being plain, I've done a bit to my poster and made a new post. I'm still not totally sure about it so I might go back and do even more later in the week.