Set the camera on manual and chose a shutter speed that wouldn't overexpose outside, as in the last picture, but this was taken earlier in the day when it was naturally darker outside. I will try the same technique when it's real bright out that window using the same combination of settings. I dont think the out of focus trees are particularly attractive, by the way. A larger aperture would have put them out of focus, but both cats might not have been in focus!