Package

reterliue

A person, like a commodity, needs packaging. But going too far is absolutely undesirable. A little exaggeration, however, does no harm when it shows the person's unique qualities to their advantage. To display personal charm in a casual and natural way, it is important for one to have a clear knowledge of oneself. A master packager knows how to integrate art and nature without any traces of embellishment, so that the person so packaged is no commodity but a human being, lively and lovely.

[试译]
人如商品，也需要包装，但没有必要过分包装。些许的夸大不会影响个人的独特品质和优点。想要随意自然的展示自己，首先要了解自己的特长与不足。包装的高手懂得怎样把艺术与自然融合而不着痕迹，这样被包装者才是活生生的人，而非商品。



[参考译文]
　　人如商品要包装，但切忌过分包装。夸张包装，要善于展示个性的独特品质。在随意与自然中表现人的个性美，重要的是认识自己，包装的高手在于不留痕迹，外在的一切应与自身浑然一体，这时你不再是商品，而是活生生的人。

Cinderella

Your translation is better than the version for reference.

A little exaggeration, however, does no harm when it shows the person's unique qualities to their advantage.
这句话关键在于理解结构。to their advantage里面的their 指的是unique qualities，是补充说明show这个动词的。怎样show呢？是有效突出这些独特的品质，让人知道这些是优点。而这句里的however，是用来表示和前面的going too far 相对比的。所以这句话和前面那句的翻译，应该是这样：
人如商品，也需包装。过于粉饰自然于己不利；但把自我的独特品质稍稍夸大一点，却是无害的。
这样翻译，才能表达出作者的原意：“我反对过分粉饰自己，但是呢，适当的夸夸自己，我赞同。”

so that the person so packaged is no commodity but a human being, lively and lovely.
试译：如此，被包装的人才不会变为商品，而依旧是人，活泼可爱的人。