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How about image sliceing into many small pieces with a program such as Adobe Image ready this means a right click save gets them only a tiny portion of your thumbnail.
If the slices are small enough (few pixels) viewers will have a great deal of trouble obtaining all the slices, much less putting them back together.
Often an offender will happily save away through the site and only when they come to browse the download directory.... WTF! roflmao.
When they look in cache, many many small bits, you can mess with the slice numbering also.
Still won't prevent screen capture though
I did this with some photoshop art I derived from original freehand work an artist friend did for me some years back.
The downside here is that you may have css/table positioning issues with different browsers (css was much simpler back then and not much used).
Worth a try? Hope so because I'm about out of ideas.
Being transgender is NOT a choice.