The ornamental design for a frontportion of a motor vehicle, as shown and described.
FIG. 1 is a right, front perspective view of a front portion of a motor vehicle showing our new design;
FIG. 2 is a left, front perspective view thereof;
FIG. 3 is a left, rear perspective view thereof;
FIG. 4 is a right, rear perspective view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a right side view thereof; and,
FIG. 8 is a top view thereof.
The portions of the motor vehicle shown throughout the drawing views in a de-emphasized and half-tone form outside the broken lines and the broken lines representing the boundary and configuration of what is claimed as the design are all for environmental and illustrative purposes and form no part of the claimed design.