click on the images to enlarge
Here's the complete breakdown of my approach towards the final sketch. I would strongly suggest all of you to try it out in this same order. Even though it does look a bit tedious... It definitely gets you the results.
The Posture Line being the most important phase... This is where you would want to really get the pose right. the balance of the subject should start looking right from this stage. This will also provide you with the groundwork to block out the subject properly. To get to the final image will require plenty of erasing... but as you can see... its all well worth it.
Once you guys have this approach really sorted out... there is nothing in this world that you can not sketch out. Hopefully with enough practice, most of you will not require all these stages to sketch.