Shadowdweller00
Hero
The image remains for the duration. Inspection will not reveal it as an illusion (as there as no passage stating such), but an intelligent creature who makes a physical attack against the image - or who witnesses a physical attack against the image - will probably recognize it as an illusion, at least long as the image remains within line of sight. The image remains as visible, colorful, and opaque as ever even after an intelligent creature realizes that it's an illusion.