心 is the picture of heart. Ancient Chinese thought that heart was an extremely important organ,
so the vocabulary which bear 心 also imply the meaning about importance.
On thr other hand, heart has been being seen as an organ which dominates human mentality,
心 can be used to describe human mentality.
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身 depicts a whole human profile, emphasizes the human body.
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頁 depicts a kneeing man, when a man is kneeing, his head looks bigger.
The original meaning of 首 is head, but now we only use 頁 to represent the meaning of leaf or page
only since it share the same pronunciation with 葉.
On the other hand, 頁 is one of the radicals of HanZi, some of the HanZi which bear 頁 as radical such as
頭(head) or 頸(neck) preserve the original meaning of 頁.