Life drawing- did it make a difference?

Did it make a difference? I don't see any *huge*difference after reading the perspective book.  However, I was perhaps more aware of the foreshortening challenges. These were all done with a brush-pen and then coloured pencil was added - only without the "pencil" part. These were Prismacolor wooden-less blocks - looking just like hard pastels in shape  but being made solely of the core material of a pencil crayon. I was trying deliberately to think of connecting curvilinear lines -without marking them on the page- and drawing quickly with the brush-pen. The top two figures were 1 minute each. The bottom drawing was a 20-minute pose and I did add some colour while the model was posing and then added more later, especially in the background. so far, I have left the sticks in their square shape , but I'm toying around with the idea of hand-sharpening- probably with a knife- one end. The shape does allow a quicker approach to noting light and shade areas. Working with Graphitint pencils resulted in more delicate drawings - as seen in a recent post- but I am currently enjoying the stronger contrast with the brush-pen as well as colour again. The human body is always a challenge to draw since  mistakes are so easily seen. Yet, there is something personal about each artist's approach. I think there is more feeling that a photo would show.