Another GREAT tip to know...
When doing your make up, try your hardest to find the spot in your house with the most natural light.
This is the BEST & ONLY light to be doing make up under as you can see flaws & true colours so clearly.
Ever see a girl walking out of the house with a foundation on her face that's 10 shades too dark?
Bet you any money, she would have chosen her foundation colour under the hideous lights in a department store, then would have taken the product home & done her make up in her very yellow bedroom or bathroom light which makes every foundation look like it will match her skin tone!
If there is no good light in your house, take a mirror & go outside!
It's definitely the better option, in my eyes.