Watch what goes missing as «faces» moves down the page, and you can see its argument being built. The poem begins with a stanza that works like a small formula: "Don't let her smile fool / Don't let her eyes confuse / Happy faces are a lie." Two warnings, then a verdict. The second stanza repeats the pattern with the emotion flipped: "frown," "tears," "Sad faces are a lie." Together the two stanzas cover the whole emotional range. If a happy face can't be trusted and a sad one can't either, no face can be read at all, and the reader is left with nothing to stand on.
The third stanza strips the details away. "Smile," "frown," "eyes" and "tears" vanish, and so do "happy" and "sad." What remains is "Don't let her fool / Don't let her confuse / Faces are a lie." Now the woman herself does the fooling, not her expressions, and the verdict has widened from two kinds of faces to all of them. The poem enacts the suspicion it describes, peeling off particulars until only distrust is left.
The grammar does quiet work here. "Fool" and "confuse" need an object, since you have to fool someone, yet for three stanzas the poem never says whom. The sentences hang open. Only in the fourth stanza does the object arrive: "Lies fool you / Lies confuse you." Two things change at once. The subject is no longer "her" but "lies," so a particular person has become an abstract force. And "you" appears for the first time, turning the warning directly on the reader. The singular "a lie" has also multiplied into plural "Lies," as if one deception has become a general condition.
The last couplet makes the subtlest move. "Don't be a fool / Don't be confused" turns "fool" from a verb into a noun and "confuse" into the adjective "confused." Earlier the danger was something done to you: don't *let* her fool you. Now it is something you *are*. One could read this as a shift of blame, since being deceived becomes a personal failing, not an injury. It is a slightly uncomfortable ending, and it makes the speaker sound less like a protector than a stern instructor.
The sound of the poem supports this. There is no end rhyme, and the lines are short, blunt imperatives, closer to a chant or a drill than to conversation. The repeated "Don't let her" hammers like anaphora should. Yet "fool" and "confuse" share an f and a long u sound, so they feel like variations of one word, which suits a poem that treats being fooled and being confused as the same experience. The imagery is just as spare, limited to smile, eyes, frown and tears. These are the features people most readily trust. Eyes are the traditional window to honesty, and tears are the usual proof of sincerity. The poem picks the strongest evidence of feeling and discredits each piece in turn, like a lawyer dismissing exhibits one by one.
Nothing is given about the writer or the occasion, so everything must be judged from the text. The poem never says who "she" is, why she deceives, or who is speaking. That vagueness lets the poem work as a general statement about appearances, but it also exposes a problem. A rule that treats every expression as false leaves no way of telling truth from lie, so the final command, "Don't be confused," cannot really be obeyed. The speaker offers no reasons, only repetition and insistence, and judging by that tone, he or she may be persuading themselves as much as warning anyone else.
That is where the poem's interest lies. In thirteen short lines it shows how repetition and subtraction can build an argument, how a verb waiting for its object can create unease, and how a small change in grammar can move responsibility from the deceiver to the deceived. It leaves a question open: if faces are all lies, what is the speaker's own certainty based on?