mostly modelled in Maya, rendered with the now defunct Mental Ray for Maya, with some painting done in Photoshop after the rendering. The clouds and the hair mostly. No ZBrush, Sculptris, 3DCoat or Mudbox.
Inspired by such movies as "Attack of the 50 foot Woman", which itself is inspired by the "The Amazing Colossal Man" and "The War of the Colossal Beast". Oh and by the way, these are best viewed in "Mystery Science Theater 3000".
Here's a screen capture from Maya during the work in progress:
I'll upvote myself, but I'll save it for later to give others a chance to earn curation. And I won't be buying votes in 3 days either.