Mostly wet on wet technique and then wet on dry for the white paint. I used a Mont Marte Round 2 brush and Reeves watercolor paint tubes.
Also concocted my very own magic watercolor paint that made the black background somewhat similar to gouache.
I learned this painting from one of the best artists named Maria Raczynska.
The third book in the "Little People, Big Dreams" series is about Frida Kahlo. I have to say, I had the most fun illustrating with this book cover. Beautiful color pop and written by the fabulous @mariaisabelsanchezvegara