A fun project where most of the modelling was done in Zbrush (first model from Zbrush really - still a learning!) the clouds and the final render was modo. Photoshop used a little as well to add the sun. Hope you like it.
Thanks Is Zbrush easy to learn - hard to answer (and I am no expert I should make clear!). If you are used to another 3d app like Lightwave, 3DsMax, Modo, Maya then it is very different and will take a while to get used to. You can many things in different ways - it's kind of a system and has huge capabilites. When you are in the swing I think Zbrush is faster/easier to create a lot of things (hard surface and organic) than other 3d apps. Check out the forums at Pixologic and have browse through - should give you a feel for what it can do. There is a load of free video training there as well that will give you a good feel how Zbrush works. Also check out www.badking.au for some ace tutorials.