FIG. 1 is a perspective view of a first embodiment of a front portion of a retaining wall block according to our new design;

FIG. 2 is a front elevation view of the front portion depicted in FIG. 1;

FIG. 3 is a top plan view of the front portion depicted in FIG. 1;

FIG. 4 is a bottom plan view of the front portion depicted in FIG. 1;

FIG. 5 is a right side elevation view of the front portion depicted in FIG. 1;

FIG. 6 is a left side elevation view of the front portion depicted in FIG. 1;

FIG. 7 is a perspective view of a second embodiment of a front portion of a retaining wall block according to our new design;

FIG. 8 is a front elevation view of the front portion depicted in FIG. 7;

FIG. 9 is a top plan view of the front portion depicted in FIG. 7;

FIG. 10 is a bottom plan view of the front portion depicted in FIG. 7;

FIG. 11 is a right side elevation view of the front portion depicted in FIG. 7;

FIG. 12 is a left side elevation view of the front portion depicted in FIG. 7;

FIG. 13 is a perspective view of a third embodiment of a front portion of a retaining wall block according to our new design;

FIG. 14 is a front elevation view of the front portion depicted in FIG. 13;

FIG. 15 is a top plan view of the front portion depicted in FIG. 13;

FIG. 16 is a bottom plan view of the front portion depicted in FIG. 13;

FIG. 17 is a right side elevation view of the front portion depicted in FIG. 13; and,

FIG. 18 is a left side elevation view of the front portion depicted in FIG. 13.

The broken lines in the drawings illustrate different embodiments of the structural environment of retaining wall blocks that include the front portion of the design and are not part of the design sought to be patented.