Here’s a painting from a couple of days ago. The reference photo is from Paint my Photo, here.
The colors used are just titanium white, ivory black, and burnt sienna. Early on some premixed neutral grey was used too out of convenience but it wasn’t necessary. Again the paper was just regular sketch paper, and you can see the buckling of it in the background, but I like how the acrylic paint feels on it more than on bristol board.