No matter how hard I've tried (okay, I didn't try that hard!) to keep my mixed-media collages on the flat side, I pretty much always end up adding some kind of dimensional objects to them! It just makes the whole piece pop a little... makes it more real... and a little more interesting!
For this mermaid piece, I needed her to have a little offering of some sort. So I cut a piece of cardstock in the shape of an oyster... and painted it with acrylics. I then brushed some Perfect Pearls Pigment Powders over top to create that cool inner-oyster sheen. I wrinkled up the edges... attached it to the collage and then glued in some freshwater pearls.
Pleased with the results, I liked the subtle way it added to the otherwise flat piece. A little dimension goes a long way!