Remember when everyone was saying "on fleek," especially about eyebrows? That was a fun time. Then everyone started saying "on fleek" about everything until it lost all meaning. Now it probably means the opposite. That's how sayings go. They lose meaning until they mean the opposite, then they mean both, and then they are gone forever. If "on fleek" now means bad, then this girl's eyebrows are on fleek.
Less is more, or KISS: keep it simple stupid. If doing your eyebrows takes the same skill that it took to paint the Sistine Chapel, then you've messed up somewhere. Some people may have to do more if they're dealing with a unibrow situation, but generally do less. Make up is about enhancing your own natural beauty, not about looking like you took a nap on top of a paint palette.