にしたら・から見ると: the difference
にしたらN2
Meaning
From the point of view of
Past papers
Tested once in past papers
Example
妻にしたら、私はもっと家事をするべきだと思っているだろう。
From my wife's point of view, she probably thinks I should do more housework.
から見るとN2
Meaning
From the point of view of, By the look of
Past papers
Example
外から見ると、やりやすそうです。
From an outside point of view it looks easy.
How to tell them apart
「にしたら／にすれば」: imagining how the person feels: pressure, complaint, joy.
「にとって」: judging by benefit and value; usually followed by 「大切だ、難しい、必要だ」. 「私にとって日本語は大切だ」 (Japanese is important to me).
「から見ると」: an outside view, judging from appearance or data. 「専門家から見ると、この絵は本物だ」 (To an expert's eye, this painting is genuine).