If you spend any time around kids, you’re bound to run into the phrase そっくり which translates to “the spitting image of” or “looks just like.” Japanese friends who know our our older son will be frequently shocked when they see our younger son and react with something like「お兄ちゃんにそっくりだ」noting that our younger son is the spitting image of his older brother.
I’ve also seen this phrase in the アニメ絵本 (anime picture book) of 「魔女うの宅急便」(Kiki’s Delivery Service). In particular, the scene where Kiki’s first customer asks her to deliver a bird cage containing a stuffed animal that happens to look just like her own black cat, Jiji. The word そっくり is used in the following sentence:
This translates to something like “Inside the cage, there was a black cat stuffed animal that looked just like Jiji.”
When it comes to resemblance, you may also encounter the verb 似る which means “to resemble.” For example, to say that someone’s little sister greatly resembles her mother, you could say: