Used stock:
Girl - http://dazzle-stock.deviantart.com/art/Lost-108488676
Background - http://allday.ru/index.php?newsid=147710
Bubbles - http://digitalphenom.deviantart.com/art/Photoshop-Bubble-Brush-PSD-110859445
http://frostbo.deviantart.com/art/Underwater-Realistic-Bubble-PS-269196532
Book - http://allday.ru/rastr
Inspiration from the work - http://djajakarta.deviantart.com/art/Here-You-Are-196540028