The exact source of the origin of the image is not always possible to find out. But it's worth a try. For example, go to Google and in the image search service press the button in the form of a camera from the search line. It has the name "Image Search".
Next, upload a picture and Google will find you all the resources where this picture appears.
Go to https://www.google.ru/imghp in the search bar, find the symbolic image of the camera. Clicking on it will open a search image dialog box: you can attach the image as a file from your computer, or specify the address of the image on the network.
This method does not help to establish the source for sure, but in any case it will find you other use cases the same picture (and there it often becomes clear what was the original).