According to Geoffrey Richardson, the Yorkist line stretched along the ridge in the distance, "all the way to the hawthorne tree" (barely visible on the horizon, at the extreme left).
Richardson also comments:
"To the right of picture, just out of shot, is the increasingly sharp drop down to the Cock Beck. The hawthorn tree also marks the point where Norfolk and his division arrived in the late afternoon, just in time to save the day for York.The two small clumps of bushes in the middle ground mark the beginning of the drop down into Towton Dale, through which the Lancastrian army had to march to avoid the arrow-storm from Fauconberg's archers before climbing the rise at the other side to "clinch" with Edward's front line"
This is a composite of three photographs. Edward's command post is
marked by the small clump of trees almost on the horizon, just to the
right of the joining of the first (left) and second photos. Note also
the line of four medium trees and a few small ones leading down into
Towton Dale, toward the center of the third photo. These trees are
also visible in the next image, which is taken somewhat to the right
of this panoramic view, showing the sharp drop into the ravine and
the Cock Beck.