Poor Ponyo! She's on a giant Fuurin! Perspective is a bit off... Sorry...
What is a "Fuurin"? A "fuurin" (or風鈴) is a japanese bell, very popular in spring: [link] Most of them represents goldfishes, This reminds me a fish bowl so I had this (weird) idea.
Done with Photoshop Cs4+bamboo fun
Credits: all textures: lostandtaken.com all brushes: obsidiandawn.com
All the best!
The colors are vibrant and very beautiful!