Neutrals are the best bet - never wear anything shimmery or shiny to one of these type of job interviews - and I totally agree with me_jelly - conservative is the best way.
DONT wear a shiny lipgloss either - sometimes that can be seen as unprofessional and honestly employers like to see smooth finishes - a satin or matte lipstick in a NEUTRAL or other non offensive colour is widely accepted, never use a frost! For some employers it is EXPECTED that women will wear lipstick to compliment the professional projection of the company. In my experience lipglosses have always been a NO GO, and also naked lips which are unlined or those women NOT wearing a lipstick usually results in comments regarding grooming and personal presentation - so make sure you wear a lippie!
Lightly with the blush - again neutral or anything complimetary to your skin tone and try to get a matte or satin finish, nothing shiny or shimmery.
Eyeshadow - dont wear frosts! Too shiny! The other mistake I often see is people with colour so high above the crease you couldnt climb it with a ladder.... dont go there...LOL!!
Dont line your eyes too heavily with liner - heavy liners can be associated with poor professional image and can result in generic sterotyping of applicants - and once its done you cant take it back!! Heavy black eyeliners are usually a no go area - stick with a brown and avoid overlining or really thick upper lashlines because this CAN look quite trashy to interviewers.
Fake lashes are way too much for an interview!! Avoid them.
Always wear mascara - always, always!! Brown or black, doesnt matter. Well groomed brows are a must!
For the love of god make sure your foundation/powder is the right colour - nothing worse than horribly applied or wrong colour - it just screams that you have been lazy, rushed (ie unprepared!!) or just plain unprofessional! And take some blot paper with you - you dont want any sheen if you have been waiting for a while, are hot or are anxious! It ruins the look and can give away personal insecurities if they see you have been anxious - and believe me, employers DO look for these things.
No nailpolish is better too - better to go for a nice CLEAN manicured looked and get them buffed instead. Natural nails give employers an open honest impression, especially if they are well manicured and the way we look after our hands tells other people a lot about you!!
Make sure you wear a perfume, but nothing too heavy or with too many base notes. Wear something light and invigorating, but nothing that overpowers the room, heavy or overpowering scent can really put other people off.
Hope this helps
