Linda, did you perhaps just save the thumbnail to your computer?
If you click the t/nail, it takes you to the proper image and most times, clicking on that image will give the largest size available.
Did you know that you can also save the image to your favourites within the RIL? look at the icons beneath each image to select the right one.
Not all images have really good keywords, which help the search - we do ask for them but I'm not sure people understand why!!
Do you know the name of the image owner?
If you do, use the members' directory (top blue bar under Member Services), search for the profile and then scroll to the bottom and choose 'This member's RIL images) - or similar.