Final answer:
The Roman Wall Painting featuring incrustation, architectural, and ornate styles is known as a fresco painting, a technique using pigment on wet plaster, commonly found in the Roman Empire, particularly in places like Pompeii.
Step-by-step explanation:
The Roman Wall Painting combining incrustation, architectural, and ornate styles is an example of a fresco painting. Fresco, a technique that involves applying water-based pigment to wet lime plaster or mortar, was the preferred method for decorating walls in the Roman Empire. These paintings were categorized into four styles by the researcher August Mau, with examples found in places such as Pompeii, preserved by the ash of Mt. Vesuvius. The entirety of the wall surface could be covered with paintings that imitated luxurious materials like marble (incrustation style), included architectural elements to extend the perceived space beyond the actual walls (architectural style), or were rich in decorative motifs (ornate style). The inclusion of trompe-l'oeil techniques, where the painted objects were rendered in a highly realistic manner to 'trick the eye' and appear three-dimensional, also contributed to the immersive and luxurious feel of these frescoes.