Hi, The writer seems to have deliberately chosen to repeat the words 'sad' and 'look'. This adds emphasis and style and arguably rhythm to what is being said. Your proposed change detracts from this.
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TakaIf the 'look' above were replaced with 'face' ...would it make the same sense?Not exactly. A face is not a look, and a look is not a face.
TakaSo these below sound a bit different to your native ear?(Seeing) their happy faces makes me realize that they are really enjoying themselves.(Seeing) their happy looks makes me realize that they are really enjoying themselves.To my native ear, yes. For that context "faces" seems more idiomatic.