Dinka Woman

Years ago I made a painting of Dinka girls, with very limited resources. The other day I found out there's a Dinka top model and now I'm working on a portrait of this Dinka woman. (Dinka is an African tribe). I couldn't get the skintones right, however, nor were my brushes cooperative. I ordered new ones, designed for the water soluble oilpaint I use. In spite of now having these new brushes, I still haven't found the right mindset to finish the portrait off.