1-Lightly sketch a circle or trace a round object.

2-Draw rounded lines that curve inside the bubble.

3-Lightly shade to connect lines as shown below.

4-Darken shading.

5-Connect with shading in the center.

6-Gently smudge with finger.

7-Add rounded rectangles and erase areas for highlights. Keep smudging and erasing until it looks good.Make many bubbles of varying sizes.Shiny spots should be on the same spot of each bubble.
