Octopuschic,
I ran into the same problem. There are three ways you can fix this.
1. Before you use your velvet display, use a piece of packing tape to lift up all the dust, lint, etc., that accumulates on your display piece. The debris adheres like magic to the sticky part of the tape. I found that storing it in a plastic bag helps a lot, but you still have to clean it before use.
2. Use a program such as PicMonkey and pay for an upgrade. They have a tool that you can use to "erase" any little flaws that may show up in your pictures.
3. I purchased a black faux leather display. They are not too expensive (about $11.00) and I am very happy with it. They are smooth and you can easily wipe them off to clear any accumulation of debris. I still use the velvet looking display now and then, but the faux leather one is my favorite.