There is one thing everyone must keep in mind when drawing
the characters in any poses and it may be tricky to do. The arms and legs
have to be in respect to their torso, and the most common mistake made
by any artists is drawing the arms and legs that are too short/long, too
small/big or out of alignment in respect to the bodies. If you have a mirror
with you, make a strike toward the mirror with your fist and that is how
far your arm can go. Compare the size of the fist with something else on
your body (like your head or chest) and this is the way you can draw the
correct size of a fist in front of a character unless the camera happen
to be very close to it that is. A compass (like this arcing line I sketched
as a guide for the arm) might also be helpful.
When anyone bend to pick stuff off the ground, they
tend to bend their knees and adjust their shoulders order to reach for
something on the ground, and naturally, that pose is bad for anyone's back.
^_^;
Some people would kneel to pick something off the ground (and it's
easy on anyone's back too).