I put all of my photo's I use in my hubs on flickr and include a link to the article in the caption of the photo. tag the photo's correctly so people can find them on flickr. You get two advantages this way.
1) people can read your hubs after finding your photo's online either through searching on flickr or through the search engines image searches.
2) the link in the image caption counts as a back link increasing your Google ranking.