Very nice start I Love silver on black look exactly what I was after. And the bubbles are great keep them. love there typography. Possibly try a different font possibly less round For "aqua". For the icon Maybe a different fish try angel fish? More corporate stylized or abstract and a stronger fish by that i mean more aggressive pose like the stingray link. But overall very great work.
#15 looking very nice now. Just an idea but Maybe a border around the drop like you had for the circle also a brighter blue? or maby black and blue?. also here is a link for a fighter fish picture for some inspiration
#54 Just wow, amazing work exactly what we were after. I cant think of any improvements at the moment. Possibly if could we see the circle with the same fill as #51? love your work. thankyou