Hmm, If I LIKE the way someone does their own makeup, I would feel more comfortable in letting that person apply makeup on me. If the person also has a similar skin tone as me, that leads to greater comfort.
I think if I’d be fussy about something, it would be eyeliner. I’ve received several compliments on my eyeliner because I apply it close to the lash line so it gives a more natural look. I don’t think I’d feel comfortable letting someone who usually applies it heavy/super thick to apply it on me. I think that’s the only thing I’d be particular about.