Hi Dale
If it were possible I would have taken shots just as you did ,and then waited for the Moose to move out in the light or as James says into the yellow field better exposing himself. I would also make a selection of the red field and brighten it up by using curves or shadow highlight if you have that available . Just my 2 cents worth. I'm glad you are selling photos I plan or trying the same thing here in Ohio.
Thanks Randall