You definitively got the basic idea! The lines are there and you can see the poses ment for each sketch. I'd advise you'd give another 30s for each sketch to outline the silhouette of the reference, ignoring minor details for now, like facial structures and such, only the outline, so you'll get how shapes and forms works for bodies. Little by little, you can integrate that 2nd wind on the 1st part, so you can learn both anatomical structures more easily and drawing faster, so when you feel more comfortable, you'll be able to draw a full silhoutte with important details even within the 30s intervals.
Off to a great start! Go go! :D