By the look of the shading and opaqueness, I think these are done with water colors. I like the use of vivid colors and grays to create these skull paintings. It speaks of the light and dark in all of us. They are all beautiful, in their own way. My favorite is definitely the 1st one. This is due to the use of anatomical skulls to sugar skulls. That level of detail in the sugar skulls, is hard to achieve with water colors. You can see similar details in the last one. I love the intensity mixed with the softness.
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