I suggest starting by discussing this with your teacher. Ask what exactly they mean by “more individuality.” How do they envision it? What specifically bothers them about the current version of the mermaid, and why do they find it insufficiently unique?
Why is it important to discuss the feedback first? Often, clients give feedback in general terms without explaining the core issues. You could make adjustments based on this, but the result might still not meet their expectations. A direct conversation, with detailed questions, helps uncover the client’s real concerns.
If you’re confident in your solution, sometimes you can address their doubts and demonstrate the value of your approach. Alternatively, during the discussion, you might discover that the issue isn’t with the mermaid itself but with the overall design concept, and that changes to a single element won’t resolve the underlying concerns.