If people are not purchasing tickets to your competition, please think about the following.
Prize Images. Try to avoid using library images when possible. Using good quality original images helps you appear more authentic and genuine and demonstrates that you actually have the prizes you are offering.
General Images. If you're designing images especially for the competition, try to keep them consistent with your brand.
Videos. Adding a video to your competition not only enables you to better showcase your prizes, but also to tell your story, talk about a cause you might be supporting and to ask your audience to enter. Videos are a great way of increasing peoples first time perception of you and your competition and can increase peoples trust.
Profile. Completing your profile allows people to put a face to your competition. Who are you? What do you do? What is your story? Do you have a website?