FIG. 1 is a perspective view of a front face of a retaining wall block having the new design;

FIG. 2 is a top plan view of the front face of the retaining wall block of FIG. 1;

FIG. 3 is a front elevational view of the front face of the retaining wall block of FIG. 1;

FIG. 4 is a side elevational view of the front face of the retaining wall block of FIG. 1;

FIG. 5 is a bottom plan view of a second embodiment of a front face of a retaining wall block having the new design;

FIG. 6 is a front elevational view of the front face of the retaining wall block of FIG. 5;

FIG. 7 is a bottom plan view of a third embodiment of a front face of a retaining wall block having the new design; and,

FIG. 8 is a front elevational view of the front face of the retaining wall block of FIG. 7.

The broken line showing of a rear portion of a retaining wall block is for illustrative purposes only and forms no part of the claimed design.