After not seeing any effects in random inspirations, I decided to focus on only one sea-creature at a time. First one to go was Aksolotl - an andorable creature with interesting body structure and colours.
Still unsure and unconvinced I went to seek help from Justin. After a conversation and analize of each design I got convinced that lower right design on the left sheet is good and that it should be carried on into further development. Sheet below shows few quick expression drawing that I did just to make sure I liked this guy enough to make him the sidekick.