竞
=
兄
+
立
:
Apollo (兄) and Joan of Arc (ji) are competing (竞) in the engine's bathroom ((e)ng4). Each of them tries to smash as many vases (立) as fast as possible.
争
=
⺈
+
肀
:
Mnemonic symbol: The grim reaper, as 争 is often used in words involving war (...战争). In front of the engine ((e)ng1), the grim reaper (争) marks his next victims in passing. With a crayon (肀) he draws big "X"s on the crane (⺈) and James II of England (zh).