This was done with oil pastels in a technique known as Sgrafitto, as part of a 100 day challenge on Instagram. I scratched the black paint off with a chop stick. Worked like a treat, so I'm planning a bigger piece with that technique.
Part of my personal project of #1111DaysOfArt, where I explore and create something every day for 1111 days. All of these are from a watercolour instruction book I followed along. It is from a Chinese artist called Zhu Qu.