Gimp Layer Mask

[iconwilly]

When I made an image in GIMP I overlayed a paper texture onto my photo making the image look like it's made of paper.
But when I transfered the image to VTF or made it my computer background, the paper texture I added seems to be missing, is there a way to add this texture to the image so it looks like this no matter what, when I put it in VTF or any other software.

Thanks.