The document provides tips and fixes for common makeup mistakes according to makeup artists. It discusses applying the wrong shade of foundation, testing makeup on the wrong areas like the back of the hand, applying too much powder which can look cakey, not applying eyeliner according to eye shape, over-applying lip gloss so lips look overdone, not blending foundation to the neck, and wearing too much makeup which can make one look old. The fixes include applying foundation in natural light, using blotting papers, applying lip gloss just in the center, and using only a light foundation coverage with targeted concealer. A consistent skincare regimen including sunscreen, hydration and moisturizer is also recommended for best makeup results.