Mango Smoothie is my favourite too. It's really soft and plain, I love it, even though my man sims don't look all that "manly" using it :D
https://i.imgur.com/3mJi6vv.jpg
Lincoln is using a lot of beat up makeup, but you can see it's still nice and smooth.
https://66.media.tumblr.com/edcd5d78568eadda13326d1a535021cf/da015bbc036b4cc7-ee/s1280x1920/9f80c46eb7c3dfe1742725a565ac0b54204d7f66.jpg
My sweet Ester as herself
https://i.imgur.com/Qaw7tYY.jpg
And Ester dressed up showing a really pale, almost white addon skin, Mango Yoghurt ( She has a pinky blush on, but you can tell the forehead is quite pale - and that isn't even the lightest setting )
Edit - Sorry for one more image, but Smoothie also looks really beautiful in dark tones as well, as Illustrated by Jayda -
https://i.imgur.com/2oEXLHG.jpg
I tried Primer, but it looked so pixelated in my game that I couldn't bear it, and I took it out. Other people don't seem to have that issue, but I do.
I'm incredibly picky when it comes to skins, it took me about six years to switch out my defaults I'd had since the first replacements came out, to Mango Smoothie, but I'm glad I eventually did.