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The two existing restorations of the genus seem to be based on the LACM Plotosaurus skeleton that was misidentified as a Plesiotylosaurus for a while. DiBgd's version is pretty obviously based on the skeleton, and Nobu Tamura's version has a head that's suspiciously plotosaurine in shape. They could be recycled as Plotosaurus restorations at best but I don't know if the artists made any interpretations that deviate from the rest of the Plotosaurus anatomy.
Photos of the Plesiotylosaurus holotype for reference: [1]