I recently had the opportunity to watch a demo with Suze Weinberg using beeswax. I have made a few collage pieces using beeswax but following some tips that Suze mentioned made all the difference in the ATC's I made.
She builds up layers of beeswax before she applies her collage images. And scrapping the final application I think is the big secret.
The photos don't show all the details...i.e. perfect pearls powder that was added and the texturing.
My base is stampboard material.