Taking over gouache

here i am trying out new things. in this case my first tries on painting portraits with gouache. Not to brag, but it doesn't look bad for the first-time gouache user =) 
I have to say i really enjoyed working with it. I do like the heavy feel gouache has comparing to watercolor. And i love very much black and white sharpness. MB because color are much more difficult to work with? Mb because sometimes they seem like a bit too much? Mb cause black is just very comforting and one can never go wrong using it? The color of mystery that leaves room for imagination. 

How do you feel about black and white art?