The ornamental design for a frontportion of a motor vehicle, as shown and described.
FIG. 1 is a front and left side perspective view for a front portion of a motor vehicle showing our new design;
FIG. 2 is a rear and left side perspective view thereof;
FIG. 3 is a front and right side perspective view thereof;
FIG. 4 is a rear and right side perspective view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is a left side view thereof; and,
FIG. 9 is a top view.
The de-emphasized and halftone portions shown in the drawings illustrate environmental structure for the front portion of a motor vehicle that forms no part of the claimed design. The bottom view of the front portion of the motor vehicle forms no part of the claimed design.