That's not bad!

That's definitely the general approach that I'd use - try to break things down into a few different features like the main head shape, ears, nose, and build those as separate objects and then boolean them together.

I think that one tip would be to try and avoid planar surfaces in general since those won't have a very soft and organic type feel to them. Like the nose there kind of stands out in your version there.

So that generally means using more like Sweep, Revolve/Rail revolve, or Network to build surfaces since those can build a more blobby type rounded shape easier without a planar end.

Here is one overview on how to build a kind of all rounded blobby shape using sweep: http://moi3d.com/forum/index.php?webtag=MOI&msg=415.2

- Michael