Certainly the following points verify that the picture was altered using Photoshop.
1. The stone wall and the iron window frame in the background are obviously inconsistent with each other.
2. The lighting reflecting different figures is not consistent. The policeman in the middle is illuminated by natural light while flash lighting might have been used on the lama in the front. Additionally, having compared the colors of the lamas' robes, it seems that the lama on the left and the other two on the right were photographed with different cameras.
3. The police uniforms in the picture are out-of-date; newer style uniforms replaced them in 2000.
4. Circles in the picture indicate traces left by Photoshop.