Here are some quick tips on Pinterest SEO.
Where to include keywords or keyword phrases in Pinterest:
1. Title of the Board
2. File Name of Your Images
3. Descriptions (500 characters)
4. Username
Link your Pinterest profile to your existing social networks like Facebook or Twitter.
Make sure your profile is visible to the search engines. Set 'OFF' to Hide your Pinterest profile from search engine.
Embed “Follow” and “Pin It” buttons to your website.
Add link to your images.
Make comment and just re-pin the other user’s images so as to get more links and followers.