As with this complex form, the general idea is to draw the silhouette of all the parts separately, and then draw the light and shadow on each silhouette. Gradually shape the body. Here we only talk about ideas.
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1, the production of ideas:
The surface block analysis of the graph. Each color represents a part.
2, Brush Preset:
About brushes: An edge-clear, pressurized, round-headed pen, a brush with blurred edges. If you don't have a digital board, just use the edge blur brush.
3, Close-up examples:
Take the red part as an example, first add an intrinsic color, according to the relationship between light and shadow, gradually refinement. The edge blur brush and edge clear brush are used in conjunction with the need.
4, the whole step:
Note that you draw within the selection of each shape so that it does not affect each other.