We don't want to be caught with our trousers down.

褪下裤子时被逮到我们可不想被打个措手不及。

We would appear to have been caught with our trousers down.

要是被抓到不穿裤子我们就好看了。

Another figure, surely the artist, lets us know in no uncertain terms, with his trousers down, just what he thinks of their judgement.

另一个人物，应该是艺术家，也不知道怎么搞的，他脱下了裤子，这就是他对那些鉴赏家的品评的回应吧。