If you use figures or tables originating from another publication, always cite the source. The in-text reference should include author, year and page number. The in-text citation is placed under the picture. A table or figure should always be given an explanatory title above the table.
If your text contains many images, tables or figures, they should be numbered consecutively and placed in a separate list after the table of content. In the reference list, you cite according to type of source used (book, article, web page etc.).
Remember that illustrations are protected by copyright law and might require permission from the copyright holder. Images that can be freely downloaded, altered and be used in any context without citing the author can e.g. be found at Pixabay and Unsplash.
In the reference list you cite the image according to what type of source the image is taken from (e.g. book, article website)