Avoid any deviations from accurate anatomical representations; the portraits should be lifelike and true to the subjects' physical attributes.
Refrain from overwhelming the scene with the graffiti elements; they should provide a modern touch without dominating the portrait.
Ensure that the portrayal of Ornella Muti and Adriano Celentano captures their genuine likeness, enhanced by the unique artistic blend of Manchess and Hewlett.
Steer clear of muted or overly subdued colors; the artwork should exude vibrancy and warmth.
Maintain the artistic equilibrium between Greg Manchess's painting techniques and Jamie Hewlett's creative vision, ensuring the final piece is a harmonious blend of both styles.