All the lighting in this image is done with texture mapped rectangular lights using procedural textures (gradients). The background is also a gradient rectangular light source. I originally created the model in T-Splines long way back and modified it slightly for Subd conversion.
The old render was done in modo:
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Did you design this whale also or you recreate existing toy?
Renders which you post recently have so much charm that they touch me. Beautiful lighting, colors, composition and design. They are really extraordinary!
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Thanks @Czaja, nice to hear that. 
The toy is not my design. I created the model for practicing. In fact I think I didn’t create the model in T-Splines back then but using Modo subdivision modeling.
Adorable !