から見(み)るとFrom the point of view of, By the look of

から見ると is used for objective judgment from a certain perspective, often based on observable facts, as in 専門家から見ると簡単だ (From an expert’s point of view, it’s easy). にしたら emphasizes a personal, subjective perspective, showing how it feels from someone’s position, as in 子供にしたら大問題だ (From a child’s standpoint, it’s a big problem).

から言うと and から見ると both express viewpoint, but differ in nuance. から言うと emphasizes interpretation or judgment from language or opinion, e.g. 経験から言うとそれは無理だ ('Speaking from experience, that's impossible'). から見ると highlights observation or appearance, e.g. 外国人から見ると奇妙に見える ('From a foreigner's perspective, it appears strange').

にしては and から見ると both reflect viewpoint, but にしては highlights a result that departs from expectations for a category or role, e.g. 新人にしては落ち着いている ('She's calm for a newcomer'), while から見ると gives a neutral assessment from a given perspective, e.g. プロから見ると ('From a professional's viewpoint').

Both can mean from the perspective of, but differ in nuance. から見ると emphasizes observation or evaluation, as in 医者から見ると簡単な病気だ (From a doctor’s point of view, it’s a simple illness). からして presents (A) as the basis of a judgment, often emphatic, as in 態度からして失礼だ (Judging from his attitude, he’s rude).

Both express judgments based on something, but differ slightly. から見ると emphasizes observation, as in 専門家から見ると容易だ (From an expert’s perspective, it’s easy). からすると・からすれば can also express viewpoint or position, as in 外国人からすると珍しい (From a foreigner’s perspective, it’s unusual).