This is not a brief with creative latitude. A reference set fixed the exact tilt, framing, scale and position of every shot, and every product in the range has to land on it 1:1 — otherwise the listing grid reads as ninety separate photo sessions instead of one.
The lighting is specified too. A flat render gets rejected: the lens has to carry a particular highlight, the same highlight, on every product.
Strap branding is asymmetric — a logo block on one side, the wordmark on the other — so left and right views are not mirror images of each other, and getting them the wrong way round is an error a customer can see. Lens tint has to match the physical product: a rose lens delivered as bronze is a returned order.
Frame geometry has to survive the jump from studio shot to model shot. Same nose bridge, same corner radius, same proportions on a face as on white. And everything ships without shadows, because the client composites one shadow layer across the whole catalogue so it is identical on every listing.