⇐ The one on the left side:
Here you can upload 3 of your pictures. The banner will only take a slim rectangle of your picture in the size you see on the left. After upload you decide which section should be chosen. If you like you can also resize this section, as you can do it in every banner.
The one on the right side: ⇒
This banner uses only a single picture. It will be trimmed to an upright one in ratio of 3:4. Of cause you may trim the picture here as well after upload. Please take care that your picture has a height of at least 600px. Otherwise the picture has to be stretched what will affect the quality of your banner in a negative way.
⇓ Finally the one below:
This one is in 468x60 and is made for 3 very slim pictures. Don't worry, also here you will choose the relevant section of your picture in an easy way after upload.