for the stock photo used in this tutorial!
This is more or less how I learned to draw things. People say you can't learn from tracing... but I feel like that's a misunderstanding bred from a combination of close-minded education and people not knowing how to learn from tracing. This might work for you. This might not work for you. But in a way, you have to treat this like studying rather than plain drawing. Either way, I hope it helps someone somewhere.
This method is best used with a bit of math. measure out how long certain body parts are according to the size of the head from chin to the top of the head. Approximations are totally okay. This is also a really general guide. You can vary it to make it more detailed by continuing to split what you have already split into halves into even more halves. There does come to a point where there's no point in splitting it even further though.
This method does not work very well if you only do it once or twice. Do it lots and do it often! The aim is to familiarize artists with what features happen where on bodies and when.
Also, note that the contours I followed included the clothing's contours, so there is no valley contour between the boobs.