So these are all layers right? You have four of them.

I would use a lasso tool to cut Mindbender out completely, take another shot of the lab at the same angle without him and then paste him back in the picture that was taken of the lab without him. This way you could mess with his transparency and keep the background more solid. I feel like it might be more dramatic if Mindbender is the top layer and that the pictures edges kind of tuck behind him slightly.

I'd also use the outerglow tool (Layer - style menu) on the memory scenes (assuming they are different layers) then find a color that will contrast the background, next add noise around the edges.

Did you consider taking the pic of Mindbender as if he's walking toward the camera, maybe a menacing look on his face by tucking his chin in. I think that would add a lot of drama.

Just some ideas.

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Cobra: The Inner Sanctum