Once the whole sea area had been covered with Prussian blue, I started working into this with titanium white. If you compare the top and bottom photos, you can see how working wet-on-wet enabled me to blend the white and blue.
With acrylics drying as quickly as they do, blending necessitates working very quickly. This suits my personal working style, but if you need a longer working time, then you can add either a retarder medium to acrylic paint or use a brand that dries relatively slowly (such as M.Graham).
