The esthetician messed up my left eyebrow?

Go back to the esthetician and complain. Tell her that she didn't listen to what you asked for, and ask politely if she's willing to re-do it. If she says no, then go to a different esthetician after that. Just be glad that she over-arched it and not under-arched it, because at least you can bring it down. You can't bring an arch back up until the hair grows out again.