Inserting items on the last version of Google Sites (which I loved) was a bit complicated. However, with the New Google Sites, it’s as easy as 1 or 2 clicks! Check it out:
Within a Google Document, go to TOOLS on the menu bar. Choose RESEARCH.
A side bar, on the right, will appear.
Remember to use ‘Free to use images’. Google allows you to search for these types of images.
Type an image you are looking for in the Research Search Box. Drag the desired image to the document. Google automatically cites the image for you.
This is a quick tutorial on how to insert an image using Google Sites.