Learning Japanese-Hiragana-MI and MU

I'm trying an experiment - the letters are sinking in well but my vocabulary is still terrible, so thought I'd use Japanese words for the mnemonics rather than english.

MI=mizu=water. MU=musume/musumesan=daughter.

I don't know whether this will work, some of the previous pictures took a while to sink in, so I probably shouldn't be making things more difficult for myself.