You use にみえる when you want to say that something or someone looks a certain way to you based on what you see or sense. It's like saying 'looks' or 'seems' in English. The pattern works for both physical appearance and subjective impression. For example, if you see a person who seems tired, you say 疲れているにみえる. If a dish looks delicious, you say おいしいにみえる. For nouns and な-adjectives, you attach に directly to the stem: 先生にみえる (looks like a teacher), 元気にみえる (looks healthy). For verbs and い-adjectives, you use the plain form (dictionary form, past tense, etc.) before にみえる. This is a common spoken pattern and is fine in both casual and polite conversation, though in writing you might see ようにみえる, which is slightly more formal but essentially the same meaning.