The look in that shot is entirely down to the composition and lighting.
The light is coming from a large window on the left possibly softened with gauze. There is some evidence that the shadows have been filled probably by a large reflector as there is no evidence of flash.The left, shadow side, of the child's face is lighter than all other shadow areas, so has probably been lifted in photoshop. The softness appears to come from the use a very wide aperture lens as the depth of field is minimal It also seems from the perspective to have been of longer than normal focal length, such as 50mm on a crop sensor.
The actual colours are quite strong for such a soft image so again were probably lifted somewhat in PS
The area around the blue guitar and that floor region has a slightly milky desaturated look suggesting that the light has been balanced by dodging that area. While the wall has been brought to a nice balance, the Guitar, mirror, floor, shadows and the reflection in the mirror have been somewhat overdone.