Here's a great picture of Heffalump off Del's blogspot ( copyright permission kindly granted by Del
) at full draw with back leg straight and elevation from the waist, if the back leg is bent to get elevation I regard this as poor form(my opinion).
A good one of Del at point blank.
One of Joe Gibbs really pushing into a heavy bow, quite dramatic looking in my opinion.
And one of Simon Stanley who has top posture when loosing arrows.
You will see a slight variation in draw, Heffalump has a long draw length so doesn't anchor as far back as Joe, this is the only reason for this difference.
Maybe costume can be superimposed on these?,
Hope this is helpful
Ruddy Darter.