Being an illustrator rather than a fine artist, using watercolour with an ink line seems to come a lot more naturally to me than watercolour alone. Not that I’ve come close to mastering the technique of course.
Sometimes it’s nice to pick one area of a painting (such as the figure) and add colour only there. This creates a nice contrast between two different textures.
After doing the below image in just watercolour in class, I felt it needed a touch more definition, so I added outlines in Photoshop at home. Hmm… would be interesting to try a life drawing straight into Photoshop using a Wacom tablet.