What is it lacking?

What is it lacking?

hello, after making my 2d drawing i have left,right,front and back versions of it. Something about the colors does not sit right with me. (even though it is suppose to be the water varient of what i am making thus the blue) I guess what i am trying to say is how to get the colors more vibrant or cartoony or i cant explain the look i want just feels like it needs something before moving to the animating stage, advice on what it needs please.

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