Watercolour practice

I am trying to work out how I am going to render my manga comic series. I am thinking for the cover I could use watercolour and print it in full colour, and then for the inner pages they will simply be black and white pen drawings with grey pen for variation? 

Ideabook

I've started this new thing called an 'ideabook' where in this book I draw out ideas and sketches from my imagination. I already do a lot of drawing from observation so I need to balance the two. Plus, I want to work on my ideas and to strengthen them by practicing and training my mind to conjure up thoughts and ideas - hence: 'ideabook'.

So far there are mostly sketches of a new manga series idea of Wizard apprentices...