A preview cannot decide whether veneers or another approach are appropriate. Ask the dentist to connect the design to the condition of the teeth and gums, the bite, existing work and your goals. A visual preference is one part of a treatment decision.
The material name does not determine the design. Emax, another ceramic or composite resin still needs a case-specific shape, shade, thickness and workflow. Ask how the chosen material and any proposed preparation relate to the change you want.
Screens, lighting and software can affect how a preview appears. Material, underlying tooth color, preparation, laboratory work and clinical technique also matter to the final appearance. Ask which limitations are relevant to your own proposal rather than treating an image as an outcome promise.