Choosing paint colours

I found a painting that will go on the wall in the master bathroom. And I discovered the Behr iPhone app: you can take a photo, point to part of the photo, and the app finds the Behr paint colour to match.

Trying to find an accent-wall colour for the master bedroom. Took the orange from this painting, tried four samples on the wall, but they are not right. Going to try the olive-green and see how that works.