I'm not convinced that I'm wrong about the underline still. The fact that your image shows up when you search for rosebud is because you have that word on the page next to the image with a correct alt tag. I don't think you get any help in the image rank from the filename you have on the picture. I think that the rest of your page is good enough for the images to appear high in the search result.
My blog pages have a high ranking on the regular search so at least some images should have appeared in the image search, but they don't.
When I have searched for images then I get a small image on the top with full page (it would be the blog in my case) in a frame below. When I click on the small image on the top, first then I get the full image at original sourse. I'm not totally sure how it works but I would think the images and the original page are linked somehow even in image search.
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