The ornamental design for a tree sculpture, as shown and described.
The file of this patent contains at least one drawing executed in color. Copies of this patent with color drawing(s) will be provided by the Patent and Trademark Office upon request and payment of the necessary fee.
FIG. 1 is a front elevation of a tree sculpture showing our new design;
FIG. 2 is a rear elevation of a tree sculpture showing our new design; and,