Meditation App UI design

This is a simple meditation app that takes users on a journey to different relaxing/inspiring locations e.g. tropical island, snow capped mountains etc using a combination of sound effects and guided visualisation. The user can chose between 10-15 different meditation themes/locations with each theme having 2-3 different meditations which vary in length.

Modern, clean and fairly minimal. The design should be one that gives a sense of calmness and serenity. Originally I planned to use stock imagery to indicate the meditation theme however I am now thinking of maybe using a minimalistic graphic design style for this. see links below.

Escapes

Screen 1:
This needs to have the title of the app visible at the top.
Then a scrollable list of all the meditation themes which when pressed opens a sub menu of the meditations for that theme. The user would press this button to open the audio page (Screen 2)

Screen 2:
Currently we have envisaged having this as a card style overlay, although we are happy to go with a completely separate screen for this. It needs to have
The title of the meditations theme
A picture to represent this - either a stock photo or an illustration.
A Play Pause Button
Some form of progress bar/display
At the end of the session the play pause button can be hidden and there needs to be a text string to indicate the session is over (as showing the wireframe)

Screen 3:
This is a straightforward menu screen accessed via hamburger menu on screen 1.

This contest is for the above three screens for a 'tropical island' meditation. If we like the style of illustrations to represent this theme we can negotiate payment for further illustrations to represent the remaining meditation themes after the contest has ended.

The description above is how we see the app but if you feel you have a better way of displaying the content than please propose it.