Step 4: Put a little drop of blue watercolor onto the wet paper and keep applying galaxy-inspired colors while the paper is wet. I added black India ink, as well as different shades of blue, magenta, pink, yellow, green, and red. Continue repeating the same exercise until you cover all the negative space.
Make sure not to create very defined brush strokes; instead, just help the water flow on the paper by using your paint brush. Your hand movements should be fluid and free.
Note that is important to use black ink or black watercolor in order to create the galaxy effect.