When you are posting material in a public site, you need to be careful about violating other people's copyright. Generally, you should be using public domain or Creative Commons images.
For more information:
The following sites have tips on the type of information you need for you citing images in various citation styles: MLA, APA & Chicago / Turabian style:
Alternative text (“alt text”) is a machine-readable tag that describes an image in words if the image cannot be displayed, for example for someone using a screen reader.
Only informative images need alt text. A decorative image that provides no information and only serves an aesthetic purpose does not need alt text (some applications allow marking such image as "decorative").
Complex images contain substantial information, for example:
The recommended alternative to writing about complex images is to write both a short and long description:
Select the image, right-click or Control and select "Edit Alt Text":
Select the image, right-click and select "Edit Alt Text".
►►IMPORTANT: always add alt text in the "Description" field, not in the "Title" field.
UofT Libraries Scholarly Communications & Copyright Office "Making Thesis Accessible" in Submit and Publish Your Thesis Guide, https://guides.library.utoronto.ca/thesis/accessibility
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