The pattern に見える(にみえる) is used to describe how something or someone looks, seems, or appears to the observer. It expresses a visual impression or subjective judgment based on appearance.
When used with a noun, に見える means "looks like (a noun)" – the subject appears to be something.
When used with な-adjectives, attach に見える directly to the adjective stem (without な). This expresses that the subject appears to have that quality.
For い-adjectives, the particle に is not used. Instead, the adjective takes its く-form and attaches directly to みえる見える.
に見える describes how things appear from the speaker's perspective. It does not necessarily reflect reality – just the impression.
This pattern is different from ~そうだ (looks like it will…), which often expresses a prediction based on appearance. に見える focuses more on the visual impression itself – how something strikes the observer.
The polite form is に見えます.