So you only want the outer edge of the rosebud embossed or all of the detail making up the rose embossed too? Embossing needs edges so if the inner portion of your rose is one solid image, you will only be able to emboss the outer edge.

If you are choosing the raised emboss setting and unchecking show object, you are doing it correctly.

Have you tried embossing text? That is the easiest way to tell if it is working.

Just a thought, but if you can get it to work in Photoshop, why not do it in there then import it into Fireworks?