A DTC skincare brand's before-and-after carousel ad selling a retinol serum. The hook is a split-frame photograph: bare skin on the left, clearer skin on the right, with a numeric 'Day 1 / Day 28' caption anchoring the transformation.
The split-frame is Gestalt proximity doing heavy lifting—two images read as one causal story, not two separate photos. The transformation creates a figure-ground separation the brain can't ignore, and the numeric 'Day 28' anchors a specific timeframe that beats vague promises. The CTA button sits exactly on the F-pattern left-edge scan path, where the eye already is.
Near-perfect single focal point with zero competing elements—the before/after earns the full 1.5-second attention window.