To paint or not to paint...

I'm working on a series of illustrations around Norwich at the moment to sell at the upcoming Clutter City event and am toying with watercolour or digital colouring, all based on line drawings done from life. Below is the train station, what do we think? I'm growing increasingly fond of not using a computer so am swaying to watercolour, which I use in my sketchbooks – but still like bold flat digital colour, oh the dilemma!