According to Byrdie, the rest of your makeup will make or break the look of brown lipstick. Cooler tones may not pair well with brown, because your overall appearance could look mismatched. Instead, opt for warm neutrals, such as a pinkish-brown blush and light brown or caramel-colored eyeshadow. If you do want to add a pop of color to your eyeshadow, such as green and gold, make sure you include a brush of warm brown in there, too, to match your lips, via Makeup Tutorials.
In addition, Makeup Tutorials notes that brown lipstick can leave your face looking "flat" or without shape. As such, you may need to create more contrast between your lips and your skin tone by using some concealer. Concealer over your cupid's bow and just underneath your bottom lip will help brown lipstick pop.
If you want to try out a softer look, consider mixing your brown lipstick with a pink shade, per Style Caster. This will give your lips an interesting hue, but still complement the natural undertones in your skin. You might also consider using lip liner and clear gloss to add more contrast and create a fuller, three-dimensional look on your lips. No matter which way you take this trend, your new lip shade is sure to earn you plenty of compliments.