Control chaos - Underwater Scene

Just finished watching a video which told me to simple start drawing. Best way with chaotic shapes and lines and not much thinking. Let your Arm do the job.

Well, started to paint with zero clue, only had in mind to finally get my underwater scene done and really it worked out for me. It took me probably 30 minutes and it came up a real concept. Watch the full version here: http://www.icepole.de/wp-content/uploads/2013/01/underwater-scene.jpg and if you're interested in how to just read through my blog: http://www.icepole.de/kontrolliere-das-chaos/ (german)

Would like to here your opinion about this technique or maybe you even got similar experience?