Disclaimer
Any drawings I attempt - are not - what your artworks are supposed to look like. This critique is to help you see something you may not have noticed before in an attempt to help you move forward to the next step. My critiques are based on subjective influence from my own experiences and tastes.
Overall Critique -
I think this is great. Nice intent set forward at the beginning to finish a quick project.
You will learn more, the more you finish.
So get too it.
One of the main things that I noticed was that your sketching was kind of scratchy. If it is possible, I suggest you start thinking about things in shapes, that can be drawn with large, accurate strokes. Not only will this make your projects go faster and save you time, it will make you start to think in a way that illustrators do with curved vs. straight lines in their shapes - and actually design characters with intent! That intent being shape language.
For where this is right now - overall its fine. Many if not all of these things that I have pointed out will be fixed by you while you re-draw, ink, marker, whatever your medium is.
Until you finish, we can't point out much more. You are on the right track. Just push on through. And if you want to critique the final product or just post it - your call. Treat it as the learning experience it is and move on.
In the future dont worry too much about, "I want to catch things that are wrong before I move on." mindset. The process itself of you finishing, IS THAT. That is what finishing is. Catching problems and fixing them, until there is nothing left to fix. Keep doing that to your own pieces by being your own worst critic. When you post that for critique - only then will you see where your skills are limited in their knowledge and execution by being shown what could be even better.
Keep pushing forward. This project is looking great and I think all you really need is to put some road behind you.
Best of luck!