Several mouths ago I found that if you use natural sand and Kommando Khaki (Karak Stone) paint for base sides and also you will have much better results!
Here is comparison photo of 4 miniatures based on 20mm washers. First figure is 80% painted Bornu from Irregular Miniatures with base sides painted with Desert Yellow, second figure is Peter Pig Egyptian Speaman with sand on its base and base sides painted with Desert Yellow, third figure is Irregular Miniatures Maasai Warrior with sanded base and base sides painted with Kommando Khaki, and fourth figure is Irregular Miniatures Settler from American Indian range with base sides painted with Kommando Khaki. As you can see figure bases on the left side look much better. Now I am going to repaint all my Desert Yellow base sides with Kommando Khaki