Just got the new issue of Nat Geo, and I was happy to find that Raúl Martín has a nice two page spread in the feature on ancient crocodiles. It depicts the giant cretaceous crocodile Deinosuchus lunging for the tyrannosaur Albertosaurus. The image was not made available online, but Martín has covered similar territory for the magazine before. Here is a piece he did several years ago; this time setting is Africa and the players are the giant croc Sarcosuchus and the spinosaurid Suchomimus. Though I must say that this illustration definitely distorts the scales of the two by placing Suchomimus so far in the background - the new one places Albertosaurus the same distance from the viewer as Deinosuchus.
The crocodile article is, in true Nat Geo style, a tie-in to an upcoming special on their cable channel. Here's a preview.
Just because I'm feeling frisky, here's another take on Suchomimus v. Sarcosuchus by the always entertaining Luis Rey.
There probably isn't any better way to depict a giant crocodile than by letting it prey on a giant, snaggle-toothed theropod.