Don't be afraid of putting on color, refine the work little by little.
Everything is beautiful, all that matters is to be able to interpret.
I regard it as a waste of time to think only of selling: one forgets one's art and exaggerates one's value.
It is only by drawing often, drawing everything, drawing incessantly, that one fine day you discover to your surprise that you have rendered something in its true character.
Paint the essential character of things.
Watercolour is not especially difficult, but I must warn you to steer clear of those pretty English watercolourists, so skilful and alas so weak, and so often too truthful.