
Originally Posted by
tinyJazz
This.
It's just lighting on the model. One likely explaination could be coloured shadows ie. Yellow light = blue shadows, orange light = purple shadows, and apparently green light = red shadows. It's colour theory.
Also it could possibly be blue bounce light. If you hold a blue ball next to a white piece of paper and you should see blue reflected on the paper (it's probably best to try this with natural light.)
If you have the animated almanac, either 1 or 2 I forget, there's a lighting chart for bumblebee's model, I'm pretty sure there's a nightlit one, now it may not be blue, but it's certainly a cold colour (I'm going off memory here because I don't know where my copy is)
Obviously it's different for 2D but the same theory applies to lighting 3D models.
Honestly, I think the cheeks look blue in the second pic anyway.