Calling all room treatment type specialists...

I bought one of those great Maxell Tape commercial posters...remember the guy sitting in his chair with the speakers seemingly blowing in his face.  Well, I don't want to put up a standard glass/plastic frame, because I think it would look a little cheesy in my room, AND b/c I don't want a hard reflective surface in the general area where the picture would. 

I would like to consider whether that poster can be adhered to a material that in turn is the top of a sound absorption panel.  I've been making my own absorbers for years with Roxul, wood framing, and the covering material of my choice (easily passes air through the fabric).  But what if I try to adhere that great poster to the face of the panel?  My limited understanding says it will reflect higher frequencies, and allow lower frequencies to pass through.  Perfect.

Any thoughts on whether the poster will be more reflective than absorptive? And what would you use to adhere the poster.  Spray on adhesive, maybe? 

Thanks.