We need practice to draw. Do you know what the use of sketches is? Warm up your hand and Speed up your model before you start drawing. With intense emotion and without thinking about proportions. Do not worry about proportions. Start this course with a variety of quick and emotional exercises. These techniques will help you get rid of the fear of white paper. Some students do not start because they are concerned about similarities and proportions. But sketching exercises will alleviate this concern.
I am a designer an ART instructor. I advise you to learn drawing basically. In all the courses that I learn you, I will teach the basically of drawing. draw a face or a cube are same. My teaching method's is from beginners to advanced. With a simple pencil or color. I try to emphasize the basic drawing. About PROPORTIONS. From whole to details. Your fears will be disappear. Your skills will be better.