This may be tricky, but you can do it if you take your time. Start at the top and then draw the slim lined shape for the head. When that is done you can continue to draw the head and face shape which can be done using angled lines. There are a lot of sharp edges to Ant Man's face. The mouth part looks more like a gas mask so draw it in this manner. If you take your time and do things in steps you can complete the task at hand.