Here our original.
We draw at first a straight line which is on the middle of a leaf, then very wafer-thin lines here such form. Only then already edges it is done rough and we erase earlier drawn contour curves.
Now we draw streaks on a leaf and very light tone an ear ring contour.
Further we fill with very dense roundabouts (a method of curls) all space of an ear ring. We shade a leaf and drawing of a birch leaf it is ready.
Watch still lessons:
1. How to draw a maple leaf.
2. How to draw an oak leaf.
3. How to draw an acorn.