A more accurate skecth would help, this sketch looks like it is in early development so an Sketch + Early Development means it shouldnt even be posted in the first place.
Work on your line work, the rough lines show that you can't handle a pencil correctly practice with your art teacher, (It will hurt
, my hands are still shaking from my practice) it will give a better , more crisp result to your art, and even make it easier to make and finish a product.
I never use reference pics, but I think you may have used one on this, due to that it more work, observance of details, and more distinct, diverse, and creative shapes would help on this.
For this sketch 6/10