Caladiums are notorious for not posting well, so keep in mind that you may receive a plant with floppy leaves. They generally bounce back pretty quickly and will push out fresh leaves.
Caladiums also go dormant over winter, so keep this in mind as when they do you will need to store the corms in a cool, dry place until spring. If you are unsure how to do this, there are a heap of videos about it on YouTube.
Each living plant is unique and may vary slightly in size, colour or shape.