If the goal is to get attention or exposure on Pinterest, there’s one thing to consider with your pictures: go vertical.
There is a horizontal limit to the size of images while there appears to be no vertical limit at all. Images that are “tall” will shrink down to the horizontal limit but extend down as long as possible.
In the image above, you can see which image stands out (and it’s not just because it’s T-Mobile’s spokesperson Carly Foulkes). The images that are wide do not stand out nearly as much.
Keep this in mind when putting together pages intended to be viewed and shared on Pinterest.