Background Image

hello, I am having the worst time trying to figure out how to get rid of this image that is on my background. https://www.seminolecriminal.com a computer and a mouse with a pair of glasses on a desk. I have tried everything, from removing the image file in my channel file manager, to customize background in theme. I cannot even locate where this image is coming from. It is referencing a tumblr image but that does me no good, i have spent several hours trying to locate where this image is to remove it and i cannot, can anyone please assist me with locating and replacing this image. Thank you so very much.