The ornamental design for a portion of a shoe upper, as shown and described.
FIG. 1 is a front perspective view of a portion of a shoe upper showing our new design;
FIG. 2 is a left side view thereof; and,
FIG. 3 is a rear perspective view thereof.
The broken line showing immediately adjacent to the shaded area represents an unclaimed boundary of the design. The broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design.
The varying density of stipple shading represents a contrast in appearance overall and does not limit the claimed design to any particular material, texture or colorway.