From my blog:
Again inspired by the students’ production (revolving a scene inside a shark’s mouth), I did another quick test in Blender. My goal wasn’t to recreate the shark’s mouth, but more to focus on materials, lighting and other settings to achieve a satisfying and convincing result.
In a scene like this different factors need to be considered; from the light sources (mainly coming from 1 side) to characteristics of materials (teeth and gums) to other real life effects (like Depth of Field).
Below I broke it down to the more important factors and passes I used for this simple test scene.
No ray tracing was used for this image.