"Photos with a rough paper surface

If you are scanning photographs on paper that has a distinct surface texture, then you are seeing the texture, and reflections of the scanner lamp from the irregularities of that surface. I really don't have a solution, it's a terrible problem. If you can see the texture, the scanner can see it better. You want to scan glossy photos, but of course, that is not a choice for this photo. To reduce the reflection, you need to be able to control the angle of the light (like you can do with a camera), but the scanner does not allow that. Even a fine matte finish is somewhat detrimental to scans.

If your SLR camera has a macro lens for closeups, the best solution is to photograph the original print, and then scan the copy. This allows you to control the direction and angle and diffusion of the lighting to reduce the reflections. However larger work may require more pixels than the camera can give."
from scantips.com