The geometry as the title suggests is found in 3 diagonal splits. The warm exciting part on the left that captures your eye. Then when you watch the picture the detailed and nicely retouched part appears in foreground. The viewer moves his attention on the details; where do her eyes look? Nowhere, and thats good. Cause of that she makes a peaceful impression, that lets the viewer relax. The right side, where there is simply a warm gray tone, supports the first two effects.
Overall, even if the picture might not look as it kicks ass in the first place, it leaves a strong impact, if the viewer takes his time.