Something that could train you draw, "everything?"somewhere.
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Oekaki Post (Time: 2m, Replay: View)
looks good, keep going&<span2=copyright.html>
>>817306P sure I asked for a tool
Draw shapes. Cubes, cones, cylinders and spheres mostly. Distort them, cut them into pieces, draw them in different sizes from different angles. This will help a lot with construction and form at least. There isn't really a tool that will help you with everything but drawing basic shapes are an easy way of practicing form which literally everything physical has