Perhaps the most effortless way to pull off a pastel look is to pair baby pink eyeshadow with a pinky-nude lipstick for an elegant and timeless monochromatic look, via Byrdie. Even Meghan Markle had a pastel monochromatic moment for her guest TV appearance on CNN's Heroes last December, by pairing lilac eyeshadow with a mauve lipstick (via Get the Gloss). One of The Fashion Spot's recommendations was going for a monochromatic peach look by pairing peach eyeshadow, blush and lipstick, as a fresh take on neutrals.
YouTuber Allie Glines demonstrated a look that had pink eyeshadow in her crease and aqua eyeshadow on the lid with black winged eyeliner. She kept the attention on her eyes by using L'Oreal Colour Riche Shine Lipstick in Sparkling Rose, a sheer pink glossy lipstick. "I just love the pink lipstick with the blue eyeshadow," said Glines. Get the Gloss noted that no matter what pastel eye shade you choose, you can't go wrong pairing the look with a tinted glossy lip.
The Fashion Spot also recommended pairing an iridescent lavender eyeshadow with a dab of frosted lip gloss. Or you could use a clear lip gloss with pastel eye looks to keep the focus on the eye, especially recommending it to be paired with bubblegum pink eyeliner or robin's egg blue-colored eyeliner. Another look The Fashion Spot suggested is blending lilac and peach eyeshadow and completing the look with clear lip gloss.