How can I retain color of original image after using overlay option?

I am a game modder who has recently started using Photoshop. My question is, how am I able to retain the exact original color (blue lions in this case) after using the overlay option?

As you can see, after using the overlay the blue lions feel like they are part of the shield (scratches and stuff), but they change color. I want them to remain blue (exact original color) while still feeling as an overlay.

Thanks in advance.