The ornamental design for a shoe upper, as shown and described.
FIG. 1 is a lateral side and rear view in perspective of a shoe upper showing my new design;
FIG. 2 is a lateral side view thereof;
FIG. 3 is a medial side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof; and,
FIG. 7 is a rear view thereof.
The shoe upper illustrated is a first embodiment showing a right-footed form of the shoe upper. A second embodiment is for the left-footed form of the shoe upper, which is a mirror image of the right-footed form, is not illustrated. The broken line illustration in the drawings is not part of the claimed design. The stippling depicted within the figures at portions of the shoe upper represent a different aesthetic feature in relation to non-stippled portions. For example, the stippled portions of the shoe upper represent a different material (e.g., a molded synthetic material) in relation to the portions that are not stippled (e.g., a knit fabric).