Since I used a black ink I can apply the stains direct to the plain white cardstock without the image being overwhelmed by the ink. I randomly swiped broken china and tumbled glass distress stains in various areas.
Next I added some crushed olive.
By spritzing some water the colors blended a little and I added a little more of the blues.
On a separate piece of cardstock I stamped the Lost Coast butterfly mermaid and colored it using Prismacolor pencils.
I added some little white dots to the larger bubbles on the background using the Inkssential Opaque Pen. I cut the colored mermaid out but felt it didn't stand out on the dark background.
My simple solution is to add a little cloud white versamagic direct to paper.
This mermaid was really screaming for stickles so I drew some scales on the mermaid tail and added some purple dots on the bodice and highlighted some bubbles with Stickles glitter glue.