FIG. 1 is a front view of a shower head showing our new design; FIG. 2 is a right side view thereof; FIG. 3 is a left side view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a top plan view thereof; FIG. 6 is a bottom plan view thereof; and, FIG. 7 is a perspective view thereof. The broken line in the Figures is for illustrative purposes only and forms no part of the claimed design.