Final answer:
The profile with a prominent forehead and chin is known as a convex profile. This term is relevant in artistic and anthropological contexts, with examples evident in both classic art and cranial studies of human evolution.
Step-by-step explanation:
The profile that has a prominent forehead and chin is referred to as a convex profile. This description often relates to anthropological and artistic depictions of human faces. For instance, in terms of bone structure, the mental protuberance provides the forward projection forming the prominent chin. Additionally, an evolution in human cranial features, such as a decrease in the size of the jaws and an increase in the size of the cranium, has resulted in a more vertical forehead which contributes to this type of profile.
In art, a convex profile can be appreciated in various classical works, where figures are often depicted frontally, showcasing their facial features such as a prominent chin and forehead. One can observe examples of such profiles in sculptures and portraits dating back to ancient times. A particularly poignant example would be the portrait heads from the Roman era that demonstrate these characteristics, such as the figure from the Palazzo Torlonia or the Homo erectus cranium with its pronounced brow ridges and forward projecting nasal spine, as identified in various figures of studies and archeological findings.
The frontal bone plays a crucial role in forming the aforementioned profile as well. It forms the forehead and includes features such as the supraorbital margin and the supraorbital foramen, which contribute to facial structure and thus to the resulting profile.