Scoring a tango!

[ojkojbgoj]

Greetings all, so my student is working on writing a tango for her IGCSE exam and one of the issues we're presently looking at is her notation/score. I'm attaching three versions she's created and would appreciate any feedback input you can provide on which version makes the most sense - in terms of writing idiomatically for the instruments selected.
Thanks and look forward to your responses
Omer

ps: any additional feedback you care to give is also most welcome in terms of dynamics, balance, articulations, tempo, etc