I have just discovered a brilliant and free piece of software called MyPaint. This allows for a very good painting experience with a wide range of pens and brushes with loads of options for customising these. I have used ArtRage before which is a great piece of software, but I just feel the simple interface and the wide range of features, particularly with watercolours, which ArtRage tried to include, will lead me to use MyPaint more.
The image below is my first attempt and I do expect to get better, but the result is better than my first try with ArtRAge.
The hard thing I find with this sort of painting is getting the colours right. However the spin off is that there is no clearing up afterwards.
As ever thanks for looking.