If, for example, you want to post a piece of writing and you'd like to include an image that you did not create, just make sure you have permission to use the image. There are a number of sites that offer free pictures. For example:
You can also purchase images online from sites like 123RF or ShutterStock.
Another option could be to reach out to the other Creatrices on the Forum (in the collaboration category or the painting/drawing or photography threads) to see if they have any images of what you're looking for.