Pins must meet search engine requirements.
For the search engine, you need to upload pins with resolution, aspect ratio and file type, as recommended by Pinterest.
To increase the number of conversions to the site, pictures with text and a CTA button work well, such as "sign up for the newsletter", "buy through the link". In addition, we recommend using popular keywords in the name of the profile, as well as adding several keywords to the description. This way you'll increase both conversion rates and users will repin you further.
Also, do not forget to leave a link to your site - Pinterest has a separate line in the interface for publication. Preferably, the link in the pin should lead to a relevant page, not to the main page or something inappropriate in meaning. Irrelevant links can increase the bounce rate of the site.
For users, you need to create interesting content that evokes some emotions, take into account the tastes of your CA and Pinterest audience. For example, optimize pins for smartphones, since 85% of the audience accesses the social network from phones.