Unevenly redrawn outline with two dark spots where the panties’ seams were removed.

A crease of the panties remains between the butt cheeks.

Uneven line where the seam of the panties was removed.

Pixellated artifacting on the hair strand and uneven body outline where the panties’ frills were removed.

Uneven line sharpness and coloring where the panties’ frills were removed.

Teal hue from the panties remaining in an otherwise completely skin-colored area.

Uneven line thickness where the panties were removed.

Note that this circle (and a few other details) is only visible in the shirtless sibling post #7691 and not in the parent and sibling posts with shirts. This indicates that the shirtless version (with panties) was a later revision done by the original artist.