.-'*`'~'` A wave should generally be symmetrical, at least for now. Also, keep in mind that ' is higher than * Perhaps something like .-*'´`'*-. would work better?
I would advise against using semicolons in waves. They are a bit too vertical and would tend to interrupt the flow of the wave.
Let's have you try another two. Try focus on making all the symbols in the right order heightwise. So if symbol 'A' is higher than symbol 'B', symbol 'A' would be closer to the middle of the wave. Try to avoid making them too choppy, but rather smooth and flowing.