So Vision, did you tell this girl how you felt about her wearing all that make-up?

I've seen this opener on youtube like
You: I don't like your make-up
She: Why not?
You: I think you use too much make-up .
She: bla bla bla
You : (Here you could recover for example with) But I like everything else though/ everything else is beautiful.or some shit.

so I said to her 'let me ask you something....why do you feel the need to wear so much make-up? You have awesome skin and seriously do not need it'....her response....'awe thats so sweet of you'. I said...'well look im just being honest, besides a natural look on a girl is just so much more attractive in my opinion. and without sounding to harsh, it is kind of a turn off when women wear to much make up'...she wasnt offended, but went a bit quiet. I said hey Im just being honest, she said 'ye i know its fine'.

next day she comes to my place......with the same amount of make up on. its gona take a bit more than my honesty, clearly.

anyway not so bothered as I dont see myself pursuing this one anyway. Ive already told her I dont want anything serious and that I am classing myself as single. she says shes ok with it, but i can she's not really.

I speak from experience, my ex was easily a 10 but she had a lack of self confidence and she used to put make up on all the time even when it was just her and I. When i said you have beautiful skin you look much better without etc etc etc she fired up and started say negative things about how i judge her and blah blah fucking blah.
Anyway to get to the point, in my opinion ( and by the sound of things ) this girl has a lack of self esteem so what you need to do is lead to intrigue before telling her why. You need to devise a situation where you see her without make-up eg. just got out of a shower, just finished removing it from the night before and just go 'Wow' ( building intrigue ) and when she starts questioning you be blunt and down right honest ' you are so goregous without make-up ' or something similar ' i like you much better without make up on ' ( even try giving make up a negative term, the last comment is the 'telling her why' ), or you could be more brash and say ' you need to get over your lack of confidence, you are perfect without make-up but with it, your just like all the other trash out there' or something less harsh ' you are perfect without make-up but with it, your like a rose in winter ( corny i know maybe tarnished mirror etc ) ' hope this helps.

Yeah I have spoken to her numerous times attempting to boost her self-confidence and have emphasized how good she looks without it. She is f*ckin hot but so insecure. These insecurities will take time to rid but at least she admits it and is trying to change.

anyway thanks for all the replies peeps.