Mermaids in Atlantis painting progress

Here are two shots of the progress of my mermaid commission so far – I have blocked in the basic colour and forms and composition, and started on the face details of both mermaids. I always like to do this initially to get a feel of the facial expressions and features that set the tone and nuance of the overall image. I have used acrylic drying retarder when painting in this technique, which gives flow to the polymer paints similar to that of watercolors.