The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a three-quarter perspective view of a shoe upper for a right shoe showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top plan view of a shoe upper, with the broken line showing of the additional shoe has been included for the purpose of illustrating an alternative environment and forms no part of the claimed design.
The broken lines showing the remainder of the shoe are for environmental purposes only and form no part of the claimed design.