These creative dots will be made by those who want to look different than others.
A small dash instead of a dot reveals the restless spirit, but it also can show that the author is in a hurry.
Also if the person ignores the dot it means that he doesn't pay attention to the details in his life and he is having a hard time following them.
Long line instead of the dot reveals a creative and intelligent person, while the dot placed high above the letter reveals highly ambitious nature.
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If the signature is completely different than handwriting itself, we can assume the author wants to hide a part of his personality. So he assumes different identity through his signature.
And if the signature matches the handwriting in size, a slope of the letters, the pen pressure and style, that means the author doesn't have anything to hide from the public. And that he behaves exactly the same in public as he does in private.