Try doing the trees as shown. These are curvaceous and easy to draw just for playing with strokes. You will notice how these sketches were formed not by drawing the details. This is to illustrate character and shading. Sometimes you will discover how drawings could be made interesting with the use of different strokes to create an illusion of an object. As a practice, you can do your own style not necessarily copying the examples above. Practice should be simple and spontaneous:
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