Adding watermark images to each 3d scatter subplot

Hi,
How can I add a watermark image to each 3d sactter type subplot in plotly at the right bottom corner dynamically. Suppose i am storing the dataframe (df_category) after each time filter and I want to display all such df_category in individual subplot. How can I build a generalised function so that the watermark image works for all types of plots?
Thanks.