@Barry try finding forums and other communities that discuss photos, file uploads, sharing and talk about your site. Get the word out organically. Start a social media page through Facebook/Instagram/Twitter and drive traffic by sharing your content with keyword hashtags that are highly searched. If you want to pay for ads, use Facebook and spend $50-$100 and drive thousands of users by creating a highly clickable ad and message. Good luck, let us know what works for you!