Hey MM.
There's actually a lot going on here in this graphic...............much more than I think I can easily explain. But I will give you the basics.
MM said:
Also Look at the stars and the effect around it.
Not at all sure what you mean by this. Could use some more details.
You may be referring to the 3D effect or just the extra grunge around the stars............don't know.
Here are the basics.
Take a BG......
Add your graphics........
Place your grunge texture on the uppermost layer......
Set the grunge layers blend mode to 'Multiply'....
Add masking to grunge layer to remove grunge from BG...........
And that's how you get the uniform grunge over the entire image.