The beauty of eyeshadow application appears when it's seamless where with layers of different colours appears well blended into each other so much that there are no harsh lines.
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The eyes open up when the right shades of eyeshadow are perfectly sculpted and are neatly applied with crease defined and all neatly done. The same goes for consistency in drawing the eyeliner which should emphasize the eyes in ways it's set out to achieve for instance the cateye, dramatic eyeliner and so on.
Seamless eyeshadow and eyeliner application becomes perfect with practise and if you've been slacking on this, learn it in easy steps above now.