可观
kěguān · HSK 7
substantial
👀 可 worthy + 观 to view = worth viewing, i.e. big enough to be noteworthy
可 means worthy/-able and 观 means to view or observe, so 可观 literally reads as worth-viewing. An amount worth a look is a sizeable, substantial one.
可 — mouth 口 + breath marker 丁 (modified)
可 originally depicted a mouth (口) with a curved stroke suggesting exhaled breath or speech, conveying approval or assent. From this came the meaning 'to permit' or 'can,' as granting permission was expressed verbally. Today it broadly means 'may,' 'can,' or 'approve.'