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Here are some tips on how to may your face look thinner:
Make up is also like sculpting, it can actually contour your face to your desired output. First, you need to make sure that your skin tone and your foundation have the same tone.
The second shade should be one level lighter.
The last shade will be your contouring color and should be darker than your first shade.
You need to be careful with blending your shades because this will be your sculpting process.
These are just some tips that you need to remember when applying foundation.