The ornamental design for a circular adjustable wallmirror, as shown and described.
FIG. 1 is a perspective front view of a circular adjustable wall mirror, showing my new design. In this figure the 8 side mirrors are in the ground position and not moved;
FIG. 2 is a perspective front view thereof, showing the fixed circular middle mirror with the 8 surrounding mirrors in an alternate position; and,
FIG. 3 is a perspective front view thereof, showing the fixed circular middle mirror with the 8 surrounding mirrors in another alternative position.