I see lots of stuff for them to eat in your pic. Deer will also keep hitting corn even after its picked. They can find the lone kernel in a hundred acre field. Least it seems that way for all the time they spend in cut corn fields. Same with the alfalfa. They paw through pretty deep snow if need be for it around here. Sticks, twigs, and dead leaves will all supply enough to keep them going. What about oaks? Around here they will gobble up the white oak acorns before they hit the ground. They save the bitter reds for hard times.