You can insert text anywhere on the page, including on the banner. Text boxes can be resized and moved around.

You can upload a picture that you have saved on your computer by choosing the 'upload' option. These can also be moved and resized.

You might have saved some images on to your Google Drive. This is a handy way to move files between devices.
These can easily be added, just choose the 'select' option. Notice how easy it is to create columns and match the height of the images.

You can search Google Images without leaving the page. Choose the 'select' option again and then the 'Google Images' tab.

You can change the default banner that is on each page to add some style to your site. The banner size can also be changed.
If your banner contains the text you need for your page, you can also delete the default text box.
Notice that it will automatically change the appearance of the image to make text more readable. This can be turned off or on.