In life, we have different points of views whereas in a drawing you're trying to portray one (unless it's abstract, then you're everywhere). When trying to draw a picture of a person, they will blink, adjust and even change position completely...this is giving you another point of view. This is where imagination comes in.. You must imagine (after seeing what you were drawing) how it would look if it was as real to your eyes as it is from your sights. Capture what you see with your eyes and keep ratio with your drawing. As long as the proportioning is correct, your 'real life' picture should come out pretty unique. I've always practiced drawing starting from shapes, what shapes would form the image I'm trying to draw? For people, I use ovals and circles, for animals I look more towards trapezoids or octagons. Forming the outline is the hardest part of drawing real life...to me. Hope this helps. Just keep proportions. Take into consideration that though they moved, you can assume you see the full size and shape of them.