This scene from Dinotopia: The World Beneath (1995) shows a tyrannosaur and a couple of allosaurs attacking a Dinotopian walking machine called a strutter.
In Dinotopia it's dangerous to cross through the jungle in the center of the island, which is ruled by large theropods. The scene takes place as the strutter crosses a shallow stream.
The color scheme is limited to yellow ochre, dull red-violets and dull blue-greens. I tried hard to keep bright blue out of the scene. The painting is done in oil fairly transparently on the dinosaur, with a little more opacity in the background.
Dinotopia: The World Beneath