If we focus on the physical contrasts:
- Physical contrasts: Black clothes vs blue skin. Matte vs glossy. Young vs old (?). Small vs big. Neat vs gross. Human vs creature. Clothes vs skin. Solid vs melty. Photo vs illustration.
If we went beyond physical contrasts into behaviour and emotion, we could highlight not eating vs gorging food; nervous vs excessively comfortable.
And if we want to take the analysis further:
- Juxtaposition: Normal-looking kid vs weird monster. Weird monster vs everyday train life.
- Resonances: Inappropriateness on several levels. The monster shouldn't be on the train because it's not real. And even if it were real, it shouldn't be so rude and gross!