Zizka's Sketchbook (Nudity and Vulgarity, NSFW)

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I think you should slowly start to create your own shape applying those concept to it.No need to make it your focus just add a small amount those form *from imagination into your study if possible and try to feel there surface of those form.

0.Zero i recommend getting some toned paper like in the example.Also not you can easly do this in digital but there also merit to doing the execise traditionally.

1.It really simply try to do first draw a really soft dough like shape with no sharp angle curve.

2.Determine the flow of the form with a center line

3.Cut your form into section that wrap around the form following the degree of the cross section in space.Keep the amount of section between 3 or 4 and don't put every section at regular interval double one of the line to imply volume.

4.Now if you have some light and shadow knowledge try to add the shadow side.

No need to use cross hatching but i suggest you do so for better control of your pen or pencil the cross hatching should follow the form.
You can use marker to to to imply the shadow side of the form.

5.If you are using a toned paper you can now add a highlight using gouache or white gel pen.


For extra point add the cast shadow of the form.