Working the memory muscles

I signed up for an anatomy course starting in July, because as you'll see in the image below my anatomy from imagination is questionable at best.

So many muscles that are put at the test when drawing something like this:
- perspective in the body
- conveying form with lines
- anatomy knowledge

So as always here is a figure from imagination..no reference.
...and as always I forgot to actually think of a reason behind the pose :D....

EDIT: Here's another quickie