1.) Dark eye shadows all the way to the brow bone. If you are working with a dark eye shadow try to keep it in your crease and under your brow bone. You want to use your brow bone for a light color to help bring light to that area and contrast your shadow. You want to use a light color on your brow bone no matter what color eyeshadow you are working with.
These are just some of the main mistakes I see everyday. I'm only trying to be helpful and if you are making one of these mistakes it's no big deal. I have most likely made all these mistakes at least a hundred times or more times each. Remember as always follow my Instagram @_phbeauty for when I make posts and leave me comments on what you want or how you like this post in particular.
And P.S the pictures are all the correct ways of doing makeup. These pictures show really amazing makeup artist and their work. They are professionals that have been doing makeup for a long time. Everything takes time and practice. :-)