ラピュタ , the robot

Robot : www.shutterstock.com/image-photo/tokyo-japan-november-08-...

rocks in the foreground :

1. stockopedia.deviantart.com/art/Lichen-Cliff-Precut-622321187

2. stockopedia.deviantart.com/art/Rock-Precut-1-214369895

Grass in the foreground : gd08.deviantart.com/art/Grass-01-png-257660908

Mountains from left to right :

(used twice ) prints-of-stock.deviantart.com/art/Ocean-Stock-7-201286758

www.flickr.com/photos/tjframe/3609423635/in/album-7215760...

Photo by Michael on Unsplash ( unsplash.com/photos/DXQB5D1njMY )

deadeye-stock.deviantart.com/art/A-Mountain-Peak-42965420

Main background : elements.envato.com/vancouver-P9JDLF4

Sky : elements.envato.com/beautiful-sunset-PM5CJE8

Grass on the robot :

1. suicideomen.deviantart.com/art/Mossy-Rock-II-667599840

2. suicideomen.deviantart.com/art/Mossy-Rock-I-667598471

Pterosaurs : dino.wikia.com/wiki/Quetzalcoatlus ( this image is not for commercial purposes , so I hope there won't be a problem using this png )

The rest is Photoshop CC 2015

Done