Have you realized that you do your make up in a specific spot every time you do it? Or if it’s in a different location than usual the outcome always looks different. You find that when you really get a chance to critique your make up it may be somewhat off than the usual. 

It’s all about the lighting. When you don’t have the appropriate lighting you can get unwanted shadows followed by uneven applications. I switched all of my lighting in my house to white lights. I find for me that no matter what with this choice of lighting my make up with have the same effect inside and outside. Including bright or dim lighting.