The best thing about the "no makeup" makeup trend is that it looks like you didn't try hard. The worst thing about the "no makeup" makeup trend is that you actually have to try kind of hard. Like Dolly Parton once said, "It costs me a lot of money to look this cheap" except that we're not trying to look cheap or like Dolly Parton so JK on that. Basically, "no makeup" makeup looks are way more laborious than you think they'd be. That being said, they're necessary in the summertime because summer is all about letting your natural beauty shine through (unlike how you should quiet and bury your nightmarish personality through all 4 seasons and always).
I cannot stress this enough. A beauty blender is pivotal to your "no makeup" makeup look's success because it blends everything out (as evidenced by its name).
Anything that has the slightest amount of shimmer in it will look like makeup, fucking obviously. Place the bronzer everywhere that the sun would actually hit your face—so yeah, no contouring. The top of the cheeks, nose, and forehead are a good place to start. Unless your face is shaped super weird, then IDFK where the sun hits you.
To mimic the color you actually turn when you 'blush.' Anything that's too pink/sparkly will instantly read as unnatural. The best one on the market imho is NARS Exhibit A. But careful to go slow when you apply because it's super pigmented and you'll go from 0 to crazy real quick, real fucking quick.
If you feel comfortable enough skipping the eyeliner altogether, good for you, but if you need it to feel like your eyes haven't disappeared into your fat face, then use a dark brown hue. And ditto for your mascara.
Nothing too red or pink, but something that mimics a human person's lip color. You can't go wrong with Benefit's Benetint.