Portrait of a Lady
Find a hidden portrait

Watch the video here: Portrait of a Lady Achievement/Trophy Guide

Portrait of a Lady
Find a hidden portrait

This can be found in Chapter 7 after you’ve completed the Propulsion Gel. You just need to get into a hidden room. Simply create a portal in the window shown in the screenshot then create another portal into the wall to get to secret room.

Once you are inside, turn right go to the room then you should be able to find the Hidden Portrait of a Lady on the wall to your right.

This will earn you 10G points for the Xbox 360 and a Bronze Trophy for the PlayStation 3.

Watch the video here: Portrait of a Lady Achievement/Trophy Guide