What would help, for yourself and for us, is to know what your goal is before you start on a finished product in order to help make a decision like that. Is it character concept art, character exploration development, an illustration? Doodles?
This is so early in the game that any of these could be something that you go with. You could spend a day and finish all six a little further and it would help us. There are no real commonalities that define a specific creature/character other than the shape language that you are using. That being some kind of ghost tale and cape.
I only have what you have given us though....
.....so our decision is based on relative 'subjectiveness'. And all these shapes only relating to each other.
You have given the audience too broad of a choice to define something for you to make. I say how about you decide on your favorite. Finish it, and bring that back for us to critique. This is how you become better at making design choices.
Because me deciding what is best makes no sense because art is subjective. I'm just going to choose the one that I like the most. Not the one that you will have the most fun painting, doing your best at, and us building you up to be even better in a critique. You may have enough time of art directors choosing the one you don't want to paint anyway, why make us decide now. After you finish bring it back for us to critique, in this thread. Finish one and bring it back. Please. You are hereby empowered!