Google Docs is ideal for collaborative projects, but saving uploaded images to the document is more difficult than normal. Fortunately, there is an easy way to capture original photos on your Windows 10, Mac, or Linux computer.
Although you can not download individual images from Google Docs (or at least not very easily), you can export them all in one go. You can do this by downloading the Google Docs document as a compressed web page in HTML format, with any other content (such as images) stored separately.
To do this, open the Google Docs document that contains the images you want to download. From the top menu bar, click File> Download> Web Page (.html, zipped).
After a few seconds, Google Docs will export your document as a zip file, which you will then need to export using File Explorer (in Windows) or Archive Utility (in Poppy).
The exported contents will display your document saved as an HTML file, with any included images stored separately in the Images folder. Images downloaded from a Google Docs document are exported as JPG files with consecutive filenames (image1.jpg, image2.jpg, etc.) in random order.
Once downloaded, you can edit the images and re-insert them into your document. Alternatively, you can use them elsewhere.
Source of information: howtogeek.com