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Are you looking to stop hotlinking, or type-ins of the jpeg? If your goal is to stop the latter, I urge you to reconsider. When someone "accesses it directly", no referer headers are sent to the server with the HTTP request.
Why would this be problematic? Many surfers use privacy products, at browser, system, or firewall level that block the sending of HTTP referer headers. Thus, direct access would be indistinguishable from one of those "enhanced privacy" pieces of software.
Why is direct access such a problem? If they can't browse the directory, and don't know image names, then how is it a problem?
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