To be a real mermaid...

It all started with a normal training session for Mi'ara. She is exercising for her next mermaid shows. Knowing that the real show can always have unexpected occurrences, she tends to push her limits further than she would have to for her real performance.
Finally she has to get up for fresh air after all though - if there weren't the lid of the training-tank blocking her way... Someone apparently closed and even locked the tank!
Will she get freed before her air eventually runs out? D:

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A great commission drawn by Darkenrok
Thank you sooo much

Fave the original: darkenrok.deviantart.com/art/C…