Perspective guide This is fairly comprehensive and a bit detailed, but a good resource.

« back to class 4 1.shading cubes »  2.shading cylinders »  3.shading spheres SPHERE Drawing spheres takes time- It requires a bit of patience and control of the marker. The core...it sweeps around the equator. Do not put it directly through the midway point... it will make your sphere look like a circle.