〜く見える・〜に見える・〜く聞こえる・〜に聞こえる details

high + looks

taka ku mieru

looks; sounds — the impression something gives off, said against what the speaker knows to be the case

meaning: look high

この写真しゃしんだと、部屋へやが広ひろく見えるくみえる。

kono shashin da to, heya ga hiro ku mieru.

In this photo the room looks spacious. neutral

え、三十さんじゅう？もっと若わかく見みえるけど。

e, sanjuu? motto wakaku mieru kedo.

Huh, thirty? You look younger than that. casual

Examples

looks; sounds — how something strikes the eye or the ear, often set against what is actually so

この写真しゃしんだと、部屋へやが広ひろく見みえます。

kono shashin da to, heya ga hirokumiemasu.

In this photo the room looks spacious. neutral

え、三十さんじゅう？もっと若わかく見みえるけど。

e, sanjuu? motto wakaku mieru kedo.

Huh, thirty? You look younger than that. casual

父ちちは元気げんきに見みえますが、最近さいきんあまり食たべません。

chichi wa genki ni miemasu ga, saikin amari tabemasen.

My father looks well, but lately he hasn't been eating much. neutral

制服せいふくを着きていると、まだ高校生こうこうせいに見みえるね。

seifuku o kite iru to, mada koukousei ni mieru ne.

In that uniform you still look like a high-school student. casual

まじめに答こたえたのに、冗談じょうだんに聞きこえたみたい。

majime ni kotaeta noni, joudan ni kikoeta mitai.

I answered seriously, but it seems to have come across as a joke. casual

私わたしの言いい方かたが冷つめたく聞きこえましたら、申もうし訳わけございません。

watashi no iikata ga tsumetaku kikoemashitara, moushiwake gozaimasen.

If the way I put it sounded cold, I do apologise. formal

そうだ
そうだ reads a state off the surface and predicts what has not happened yet (雨あめが降ふりそうだ), while く見みえる compares the impression with what the speaker takes to be true — 若わかく見みえる only means anything to someone who knows the real age; そうだ also refuses a noun host (×学生がくせいそうだ) where 学生がくせいに見みえる is ordinary, and it takes over entirely for someone else's feelings — 悲かなしそうに見みえる, never ×悲かなしく見みえる.
っぽい
っぽい judges the thing itself and sticks (子こどもっぽい人ひと is childish whatever he does), where に見みえる reports only how it came across on this occasion (子こどもに見みえる says he passes for one), so a compliment survives に見みえる and rarely survives っぽい.

見える・聞こえる
The same verb, and on a noun host one particle decides everything — 子こどもが見みえる reports a child in view, 子こどもに見みえる reports that whoever you are looking at passes for one, so が answers "is it there?" while に and く answer "what does it come across as?".