Painting - see one, paint one

I met some friends for dinner at Ken's Artisan Pizza - it was fantastic, by the way - and saw these paintings on the wall. I thought 1. that they looked pretty cool, and B) that I could do something similar with watercolors.  

This is my much, much, much smaller version.  I tried a larger one, too, but it was less successful so I'm going to have to revise my methods for that one.  But I very much like the end product.