Final answer:
Recommending products should primarily occur during the consultation stage of a visual makeup service, but may also happen while applying the makeup or after completing the service.
Step-by-step explanation:
Recommending products during a visual service like makeup should primarily take place D) During the consultation. This is when the professional can understand the client's needs, skin type, preferences, and what they are trying to achieve with the makeup application. It allows for a tailored recommendation that can enhance the service and ensures that the client feels cared for and informed. However, this does not preclude additional recommendations C) While applying makeup, when the makeup artist can illustrate the benefits of a product in action, or B) After completing the service, once the client can see the final result and may be interested in purchasing products to replicate the look at home.