I am just trying to draw the shadows and the decorate. I use 2B F HB draw this. The most surprised me the most is that the frog on the top is very had to draw. This is about shadows and composition. The most difficult challenge is that the details on the decorate. I watch them very carefully and draw them bigger so it's easier to draw details. I learned that there can be a lighter shadow on the outside of the big dark shadow.