My hobby is Watercolor  painting. Do you paint?
No, but I can see the appeal of painting.  Is it true that you can mentally relax by painting?
When I fist started Watercolor. Once I realized art is what I make it to be it became relaxing. 
What kinds of pictures have you painted with watercolors?
I normally do water on paper and I paint nature, landscape and the occasional model. But I'm terrible at paining models.  
That's ok.  go look at some of Michaelangelo's paintings of "women."  He mostly drew men first, then added feminine features later.  They didn't look too good, heh. 
Lately I've been messing around with making my paintings opaque by adding Chinese white. It add's a nice contrast.