I have a couple issues with this.

The connection to Specular_Color is doing nothing, because you have it set to black, resulting in no effect.

In any case, it is extremely unlikely that you actually want a specular reflection. If you had one, it would make it look like exactly what it is - a wall with a photo on it, instead of a 3-dimensional scene behind the figure.

I'm not convinced you want the photo to "interact with lighting". If you're using a spotlight on the figure, do you want to see the ring of light projected onto the background photo? Again, that would make it look like a wall with a photo on it.

I prefer to turn off all lighting - set Diffuse_Value = 0 and Specular_Value = 0. Then connect the photo to Alternate_Diffuse. If you want it darker, then decrease the white value on the Alternate_Diffuse to a shade of gray. Or to give it a different tint, put a non-gray color in.

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