I started to work on this animation for more than a month now and I am finally done !
For this final part I had to add some colors in this layout. I already did the little merman last month (you can see this version in here : ready to stand) and after some little changes, I spent two days coloring this unusual background on Photoshop. Then, I used TVPaint for the last details like the shadow and the bubbles.
You can see the linetest version via this link : merman