This week's pair: face-left vs face-right. 11% delta.

Identical thumbnail, mirrored. 62k impressions each.

Face on the left: 5.1% CTR. Face on the right: 5.7%. Consistent with the last four times I've run this.

Theory: text sits left in LTR reading order, so face-right means eye lands on text first then resolves to the face. Face-left makes them compete.