Diffuse Painting Progress

I've been using Zbrush to paint the diffuse texture for the walls. There's a lot of space to cover and I have to zoom in close to make sure micro details are captured. It has been really helpful for me to use photo textures from my library to help me with color since I struggle with color blindness. I use Zapplink to link up with Photoshop and then project the photos and even do some hand painting too. In Photoshop I use layer masks alot, that way it's like I'm painting with photos. I just make a brush stroke where I need different texture materials to show. This technique is fast so allows me to easily get huge amounts of detail so I can worry about the big picture.